Foxfarm Happy Frog Soil and feeding...

Should I feed less while using this soil?

you should monitor your ph in that soil - i believe happy frog is out of the bag low - like 5 maybe?
i don't know about feeding in it
here's a chart thingy from the internetz

Thanks, man!!! The pic is awesome! That will be very helpful!

...Also, what about mixing this soil with coir, peat moss, vermiculite and perlite?

If you want a peat based mix go with OF. I used it and didnt like it as much as HF. I mix about 20% perlite and 1tsp of lime per gallon of soil. Not sure youd need more vermiculite, it retains water pretty well even with added perlite. Never tried it.

I'm really trying to get the organics and mycorrhiza and stretch it with the coir, perlite and vermiculite to keep my costs down.