I too hate the Vega super but I think that you have to dash at just the perfect time. The Vega player is taking a risk, going for the super so Capcom made it so that it is easy to hit. But I believe that you can dash under it at just the right time. Or you could could try and, say jump fierce it really fast/ Because the Vega player is trying to hit you on the ground but if you immediately attack him in the air, then he might not expect it and it will knock him right out of it. I don’t know exactly but I think those might work.
For Safe jumping:
DeeJay: My advice…DON’T JUMP!! DeeJay’s upkicks is probably one of the best antiair specials in the whole game. It is MEANT to autocorrect. So if you see him charging downback or on wakeup, DON’T JUMP!!! You will rarely actually succeed. In fact, DeeJay doesn’t have a very good wakeup game if you don’t jump.
Makoto: Try and hit her with the toe of your kick (I assume you play Ken?) from your roundhouse. This should stuff her uppunch on wakeup because her hitbox isn’t THAT improved. However, your reward is pretty much a sweep or (if you space it right) a c.forward hurricane kick combo. Try and not cross her up as that is primarily what the uppunch is meant to stop. So if you do want to jump in on wakeup, try hitting her with your toe. Don’t try and do it on a footsie game as her c.roundhouse(?) is a pretty good AA from afar.
Cammy: Cammy has one of the best AAs in the game. It is just like Ryu’s strong uppercut. You should safejump it just as you would safejump any shoto’s uppercuts. Nothing too complicated, BUT I do thing the Cannon spike autocorrects more often than an uppercut but there is nothing you can do about that.
As for Guys flip grab, your best bet is to either forward dash out of it (WARNING: If he elbow’s it will hit you) or try and do a deep uppercut. The uppercut should beat the flip or land on the other side so it is best to just do the jab version of the uppercut but he can still hit you if he elbows intead. DO NOT jump or uppercut early as he will grab you clean.
Hope this was helpful!