Before you buy anything else take a few to read and learn about what plants need. Google or buy a good veg garden book.
You basically built a big container, and filled it with great ingrdients, that had little nutrients. Step 1 fill the container , step 2 fertilize the plants - you forgot step 2.
Plants need macro and micro nutrients. 8-4-4 are macro nutrients. Find out what each number means and what it can do for the plant. Go over to the container garden forum - seach for Al, there are many threads on fertilization of containers.
Remember too much fertilizer is not a good thing.

Mike

I'm not sure why they suggested such a high percentage of bark fines.......these are usually recommended for container plantings as they hold up well and provide a high aeration/fast drainage component. This is much less of a concern in raised beds - drainage is characteristically fast in these even with a more traditional soil mix just by virtue of their elevation. Often too fast :-)

Because of their woody nature, the bark fines could well be tying up available nitrogen and I think you are correct in your assessment. Blood meal, alfalfa meal and bat guano are all relatively fast acting organic source of N. Or if water soluble, the organic stuff from HD could work also. Composted manure (if properly composted) is a great mulch or topdressing for any veggie garden, raised or not, but I'd not look to it for a fast N solution.

Mike, I was composing my response as you were posting yours :-))

Raised bed gardening is far more like inground gardening than it is to containers :-) Most of the aeration/drainage issues common to container gardening do not apply. That's why you can get away with using regular ole garden soil in a raised bed, together with whatever OM is at hand......not something that would produce similarly successful results in a container situation :-) Ergo, one would want to fertilize a raised bed planting similar to how one would an inground planting bed. With the OM the OP has already got incorporated, I believe the necessary nutrients are very likely present, with the exception of the N for the reasons I gave. Regardless, the 8-4-4 forumlation most likely has a variety of micros included - most do. It is only the primary nutrients that are disclosed on the NPK ratio....the others should be listed elsewhere on the packaging.

If you have clay soil with no organic matter, it would be like a box in the ground & I could see why someone could think 50% pine fines. But if you have sandy or loamy or even clay loamy soil, then you would not need it. However, now that you have it, no worries. It will not hurt anything, but maybe the pH.
The person may wanted to sale you something or just did not know what you needed. You can know with a soil test.

Here is a link that might be useful: This is what I use to add nutrients to compost.