I found some stuff but it requires Tension, so it's up to you whether or not you want to spend it to get knockdown for Oki off of 2H. http://youtu.be/itHybI6TRsI
Notes: -All May combos work on Chipp. Last May combo I think is universal for all the other characters in the video... except Elphelt.
-Spacing-wise all of these work after a full range backdash, from point blank, and closer. The momentum from 214K pretty much always gets you in the same spot to do your air combo.
- If you are farther than a full backdash away, the 214K might not connect. You can circumvent this by RCing the startup of 214K to get its momentum, which you can then follow up with an air combo. These are always the least damaging variants though.
-The more hits of 214K you get, the more damage you will do (generally). The trade off is that it becomes harder to get an untechable knockdown after it.
There might be other, more damaging, variants of these combos because I made them up fairly quickly. It's up to you whether or not you think it's viable because of the meter expenditure, but the option is always there.