^ If you untech them and your jump in attack is whiffing then it’s too early and you are doing it wrong. The only group you want to show an early safe jump (fake safe jump) is on Shoto’s.
Look in the Match Up thread and check “General Info” on the first page and there should be some safe jump videos and a safe jump guide, you should be able to get a gauge on the timing from that. Your dive kick should always hit, make them block, or reverse if that is not happening then you aren’t doing a true safe jump.
The timing windows for each character type that you can safe jump can vary. Guile, Dee Jay, Cammy, and Chun Li with EX are the hardest to safe jump; And then you have Makoto and Dhalsim being the easiest to safe jump.
The timing for the first group is pretty much the same except Cammy, on her you have to delay 1 frame to make sure the dive kick hits/makes opp. block/reverses (if I remember correctly). Once you get the first group I mentioned down pat, every one else will be a piece of cake.
I will tell you after cr. roundhouse you have to immediately put the GF input in to do it correclty. I use the piano technique (I enter my motion immediately after cr. roundhouse and start pressing the desired k button like crazy).
I don’t know of anyone who’ve mastered the art of safe jumping without practicing the hell out of it, so I wish you well during your extended hours in training mode to unlock the secrets of the Gouken Flip.