Hoya lobbii can be a slowpoke, with both growing, and blooming, at least in my experience (with the growing; mine has yet to bloom). I got my lobbii earlier this year, around May, and it has just started with new growth. I have heard it can take 2-3 years to expect blooms from lobbii.
Pubicalyx can take awhile to bloom (3-5 years, in some cases), but Pink Silver DOES grow rampantly, once established.
DS-70 is what some refer to as an early bloomer, often blooming within the first year of rooting.
You can get most any hoya to bloom early, in my honest opinion, as long as you provide adequate light, nutrition, and environment. There are some hoya though (and eriostemma), that are bloom-stingy. The one that has bloomed earliest for me (on my own, with the exception that this particular hoya grows peduncles at every node, so I was bound to receive a rooted cutting with peduncles) is burmanica. It is a hardy hoya that I managed to get two lonely blooms out of, but I think it is still too young to have many more. That being said, it has put on quite a few inches of growth since I received it, so it may bloom better sooner, rather than later.
Most of my hoya have JUST rooted or are just establishing new growth after being rooted for awhile, but I have many that are supposedly early bloomers (within the first year or two). Time and care will tell.
If you want a list of early bloomers, Joni at SRQ has made one and I have linked it. It is not complete, and you probably won't find a complete list, as not everyone has every hoya (and growing experiences vary), but it gives you a rough idea.

Here is a link that might be useful: SRQ Guidelines

I don't know this for sure, but from her language, it seems to me that Joni's "bloomingest Hoyas" list refers to how frequently the species bloom, not how early. That is a nice reference, though.

For me the earliest bloomers were javanica, lasiantha, heuschkeliana, davidcummingii, finlaysonii (and all closely related species e.g. sp. Kalimantan, callistophylla, etc), DS-70, tsangii (NOT wayetii - form. odetteae), lanceolata ssp. bella, lacunosa, publicalyx 'Silver Pink', carnosa, lobbii, litoralis, cystiantha, pachyclada, cv. Christine, australis, fungii, obscura, patella, polyneura, polystacha, EPC-229, tomataensis, paulshirleyii

I just received manipurensis from Joni, which she says is an early bloomer, on her blog. She sent me a plant with a mature peduncle, but it has already formed a second peduncle and has bloomed constantly since arriving, so I am quite impressed with it.

If you just put your carnosa in good light, (e.g. right up against an east or south window) it is probably mature enough that it will bloom the next season. A lot of Hoyas are like this - if you've had them 2-3 years and they aren't blooming, bump up the light and away you go. Many of them are tolerant enough to bloom in inadequate light; it just takes them a lot longer. But I don't think carnosa really fits into this category - I find it very very stingy with flowers indeed, if the light is not high enough. So stingy it will only bloom once every 10 years, maybe. So you might as well give it what it wants! ;)

The three you list are all early bloomers and good bloomers. H. lobbii bloomed last of these for me, but it is a personal favorite because once it matured it immediately formed many peduncles and bloomed consistently. Like many Hoyas, its buds develop in waves, so that as one group of flowers expires, the others open, so the blooming period seems to stretch on forever. Plus the flowers are saturated with rich color and large enough for you to appreciate every detail.

This post was edited by greedyghost on Mon, Dec 22, 14 at 11:05

Hoya heuskelliana, obscura, pachyclada, jennifer, lobbii, paulshirleyii.
My carnosa blooms 8-10 umbels at a time getting lots of bright partial sun and tons of water during rainy season.

My carnosa also took an incredible amount of abuse, before I got a clue how to grow them. The original one has not bloomed yet (it's been 3 years 2 months, including the period of abuse). But another carnosa ('Rubra' aka 'Krimson Princess') did bloom for me as a 1 year 5 month old plant - from when I got it as a small rooted plant, not from a cutting.

My lobbii IML 1427 is in large bud now for the first time, at 7.5 months from cutting. So, I would not call this clone a slow bloomer at all in my case.

Heuschkeliana and DS-70 bloomed for me at 5 months from cutting. Heuschkeliana tried even earlier - the first buds formed on my watch less than 7 weeks after planting the cutting, but those buds and several sets after those all blasted.

H. davidcummingii bloomed at 5.5 months from cutting, and it has the distinction of the first hoya ever to bloom on multiple peduncles at once for me. (And by "multiple" I really mean "two" lol.)

Lacunosa bloomed at 13.5 months from cutting, and that also came after a previous try was aborted.