I decided to try Kiss setup so I bought Kiss v1 FC and setof Kiss 24a ESCs + Matek HUBOSD-SE and put it into my MartianII 220 with T-Motor F40III that was running Matek F405-AIO and Tattoo 35A BLHeli_32 ESCs.
The build it sefl was bit challenging becuase it involved lot's of soldering. Thankfully there are lot of guides and great wiring diagram from Phillip Seidel.
Trouble came when I tried to flash the lates firmware. Apparently you have to hold the boot button all the way and it took me a while to find that out. Meanwhile my KissFC was "bricked" and I had trouble to put it even to DFU mode. Luckily I managed to flash it and all works now. Kiss flies really great out of the box. I did not have to tune PIDs so far and video is jello free. Rates are bit different. I have to get used to it.
I also updated the frame with some 3Dprinted ESC covers and rear antenna mount. That was also fun.