You HAVE to live with the fact that Abel does'nt have a "OMG Troublz wat do i do SHOORYUKEN!!" or a Jesus Kick. Make em play a ground game cuz on the ground Abel can be even with everybody.
With jump-in my answers -
lk Roll > Falling sky works kidda like a upside down crossup, this works on Hurrican kicks too, practice it, see your yourself. in my experience this is hharder to land on high verticle jumpers like Chun, Bison, Blanka and low Quick jumpers like Gen, Balrog, Vega. I recommend that on shotos.
neutral jump HK - not the best thing in the world but it works, work on the timing.
Jump back FP - beats/trades with crossups, good damage.
Roll away to safety - if you down think you can do anything on reaction Roll far away(mk Roll at least). Some shotos will get frustrated that you're getting away alot and they WILL try to catch you with a Hadouken on recover, Let them eat Ultra
Block > back dash - i dont do this alot cuz Abel's back dash is not the best in the game.
lk Wheel kick - dont spam it, but you can control spacing with this, if you telegraph a jump-in Wheel kick em down
basically dont let em run a a jump-in game. There's no one answers for Abel, do everything, dont be predictable but give em alot to think about.