I once studied chemistry - in high school... I have no clue what these different formulas do. I just use the chemicals.
Ansco 130 (from Photographer's Formulary) really is a good developer for film. I've done nearly twenty 5x7 sheets in it, and it gives me great negatives to print. I've used 1+4 and 1+8 so far. I like 1+8 best as highlights seem to print easier.