I recently did some Fomapan 400 sheet film testing with HC-110 at 1+30 (20ml to 600ml using a densitometer to determine my film speed) I found that the best speed for me was ISO 250

I used a Jobo rotary processor and at 21 degrees C the time was 5 minutes 45 seconds for standard development.

This is just a guide for you to start with, hope it helps. Oh, this was for the concentrated syrupy HC-110 not the thinner HC-110 often found in Europe.