10/12/20 update: i put PID below. it's ok. if you're not recording videos then it's flyable.

i think i've found the best use for RX3020.
there are a few reasons for it.
RX3020 are fragile, the heavier the setup the easier for those props to explode.
i've tried them with 1103 which can handle these props better. but because props got destroyed so easy, so i stopped using these props with 1103 motors.
i've also tried 2s 1102. but in order to use 2s i have to add 10grams to all-up-weight which is 25% more weight. it still flies fine but i don't thing it's worth it.
if you think of trying bigger motors, don't bother. it's not worth it. and also 0802 motors with these props are not worth it.

one more thing. if they stop using the old plastic that would be great. same weight but more durable.

check out the speed it's running in the video and i already clipped the throttle at 70%.
it's fast for 1s and it's faster than many 2.5in setups
i can power-loop over my house, over and over if i want to

the build:
26grams dry
Geprc 1102 14000kv or betafpv 1102 13500kv
props: RX3020
frame: Alexandre Arvinte's PicklePick frame ( 3 holes mount )
board: Crazybee lite 1s build-in VTX and RX
cam: Runcam nano 3 with old lens ( they don't sell it anymore )

PID tune:
betaflight 4.1 or 4.2
R: 86, 83, 61 ff: 150
P: 91, 85, 63 ff: 150
Y: 71, 76, 0 ff: 150
No D_min
PTA: 0.35 breakpoint: 1400