My first "real" acro / freestyle trick flight with the Quadrysteria Rush 4". I really like the way this copter flies. It's got just a bit less raw speed than a 5" setup, but it accelerates well, turns on a dime, and floats really nicely for acro.
Firmware is Betaflight 2.9.0 and BLHeli 14.6. Oneshot125 with 8kHz gyro and 2kHz PID rate.
Battery used is a 1300 mAh 4S. This is a bit heavier than some would say is ideal for this frame, but I'm also not carrying an HD camera, so perhaps that cancels out.