I'm maining Guile and recently I've been on a lose streak against the same guy who is maining Ken/Ryu (switching one after another), the guy is not that skillful but the deal is:
Every now and then at start of the match he used to jump in at me probably he thinks I'd throw a sonic boom at start, but instead I always crouch down and hit him with flash kick. However, later on in the game, once in a while when he jumps in at me while I'm in crouch down position, I try to execute flash kick or crouch down + HP but none executed (I just appeared idle and I can“t figure out the reason) and I just get knocked out.
How do I improve my game playing as Guile against Ken or Ryu?