First off, welcome and please start a grow thread for us all to follow along.. you'll get a lot more help that way to.
I use felt pots and love them. just ordered 20 more, went with 2gal, but taller then normal at 10".. I use felt pots
and the Oxy Pots and get great results with either one. but here is the biggest thing I've found.
So much better off starting plants in 1gal plastic nursery plants, 1/2gal smallest I use. why plastic to start u ask.
It allows the plant to start the larger roots that help establish a good foot hold in the soil, found using felt to early air trims the roots and no root ball to speak of. when I up pot after my AUTO's ***, I switch to felt or oxy pots... now
as the roots get air trimmed, feeder roots are born allowing the plant to uptake nutrients and water better..
FFOF can be used, and like you said, by the time it hit the hotter soil the plant was established.. just be careful feeding on top of it..
good luck..