Street Fighter EX2 Plus (PSX): Help with comboing Guile's supers

playing sf ex 2 plus and i have a question: how in the freakin hell am I supposed to combo guile’s opening gambit into flash kick super? Is it possible to charge for two supers at the price of one? Im doin’g J.Fierce, C.Mp (charge back), fierce sonic -> opening gambit…but I can’t get the flash kick super to come out AT ALL :(. Help, thanks!