I agree with Vladimir. Your trees look great! Your trees are still young, so they will drop most of the fruit, but next year you will get more, then more, etc...;-)

Don't feel bad. I have a Ponderosa Lemon tree I bought in full bloom and fruit last summer, and this summer if flowered and the flowers all fell off along with blooms just like that. None of my other trees do that and Ponderosa are notorious for flowering a fruiting. Lord knows what happened since I treat it like all my other trees..(

In your second picture some of the large leaves higher up look a bit speckled to me. Have you checked for pests such as spider mites?

And slightly left of centre there's a leaf yellowing at the margins. If there are more leaves like that it could mean a deficiency eg. magnesium.

I can't see the tree properly and the rest of the leaves look great, so it might be my imagination. Just thought I'd mention it.

Thanks Robin, I haven't seen any bugs and use neem oil every 2weeks. For some reason the top all look like that. I use foliage pro too. Not sure if there's a deficiency

Sounds like you have those things covered. Sorry I can't be more helpful!