wild forager:

5-10-5 used to be commonly sold by bigbox stores like Home Depot, but that may no longer be so. However, I don't really see a serious problem here. If you are concerned about excessive nitrogen, use the 10-10-10 and apply a smaller amount.

When I had potted figs (I have since given that up) I had to change out the soil and prune the roots every 2 years anyway to keep them healthy, so never applied any chemical fertilizers at all. Finally decided that all this lugging big pots in and out, storing them over the winter, soil changing etc. were not worth it for figs that I didn't care that much for anyway compared with other fruits I can easily grow outdoors.

Don Yellman, Great Falls, VA

You don't need to fertilize those trees in a home garden.

Instead maintain a 2 to 3 inch deep mulch of compost on the soil surface.

So, the compost will act as the fertilizer for the container?