Hi Sven,

A little less dihedral will work just fine since the Tiger Moth has plenty of rudder authority.

Vicman's suggestion to replace the NiCd pack with an NiMH pack is a good one. You can double your flight duration for the same weight and add a cell (or two) for additional top end power.

If you want a bigger power boost, you can use a 3-cell Lipo pack if you swap the DX-A geared motor for a DX-C geared motor and use the same prop. No need to change the ESC when switching to Lipo cells. The GWS ESC will cutoff the motor just fine.

Good luck and welcome to the Electric Aircraft Universe forums of RCU.