Container Soil Fertilizing and Worm Castings

So I've read through all the sticky's at the top and have to say that all the information in them rings true about organic matter in containers breakign down too quickly and causing compaction. This is a problem that I had, and switched to a potting mix that just so happens to fit the bill of what was recommended. My issue is that I fertilize organically and have primarily used compost, teas, and castingings.

I plan on switching to a granular organic fertilizer rather than heaping compost and mixing into my pots. I'm going to use the granular with the hope that I will at least limit some run off. Any other suggestions on how I can organically fertilize my plants? (citrus trees, ficus, few succulants, herb garden, and vegetable garden).

Also, I vermicompost so i have readily available castings that I use. After reading the sticky's it seems that mixing this into the soil may not be the best for my soil integrity. I plan on using this as a starter medium for seeds and cuttings, but I will still have quite a bit left over. Would it be inadvisable to at least top dress my plants with the castings?

Thanks for your help.

I grew my Japanese morning glories in containers. They did great. I started the seedlings with myccorhizal fungi then used a very low phosphorus fertilizer every other week. I used worm castings too. I will do more with compost and compost tea this year.