After a CH44A I think 3KK is the only guaranteed combo and you can follow that up with the usual 236K. If they are close enough I will sometimes mix up between grabs and 3B/66B, the 3B mainly if you end a wall combo with 44A to re-wallsplat them.
3KK is also pretty inconsistent. I recommend just sticking with BB like ZeroEffect said. Also, take the CE if you have the meter (you're Patroklos, so you probably will) because the damage is retarded. It's his strongest CE combo besides B+K if I recall, and off a mid horizontal that's -2 on block. Balunz
'Kay, 44A combing with 6B.B.B is range/angle-dependent. If you stun with 44A at tip range near wall/edge, 6B.B.B will connect. It's also happened at closer ranges if you hit them at an odd angle.
I'm not sure if 3K.K is range dependent, seeing as 3B W! 3B W! 44A 3K.K combos.
A+B:[A+B] → 1B BE → CE works on Asta, Nightmare, Siegfried, ZWEI, and Voldo at some ranges for 171 damage. Doesn't work on Viola or Leixia. Didn't test the rest of the cast. I laughed out loud when I found this though.