I will post specific Baseflight.hex for normal and 3D operation when the frame is used with CHATCH motors - MT2216 1100kv. This is for Naze32 controller board offered by Abusemark.
The flat arm frame has a very fast oscillation at full throttle that stems from a huge amount of power difference between hover and full throttle. One single PID setting is not enough to control both "normal" flight and full throttle climbs.
You can tune it out but it is either very hard or results in too watered down PID for "normal flight"
3D operation: TPA applies on top 10% and bottom 10% of throttle curve. You can set TPA in both multiwii GUI or CLI
Standard operation: TPA applies on top X percent of throttle curve, as specified by TPABREAKPOINT.
This allows locked in performance over the entire throttle curve without side effects. I'll be testing it more and posting the files in a few days.