Hi guys. Have a heavylifter, custombuild by me on CS frame, longer boms etc. FC 2.2 upgrade, navkit, tiger 3515 engines with 15/4 apc and herkulesIII as esc, FF 6s 9000 lipos, all with latest FW. FC .90j, NC .30n, and H3 on v3. The HL flyes kinda OK with some hopping, moving, nervous light jerking mostly at hover, tweeking left. But I cant get the AH to perform well. For the record we have 3 more cs8 birds with all newest mk electronics, fw and fc 2.2 upgrade. I do all the tuning and config, and all 3 flyes like a charm, the AH with the upgrade is perfect! GPS hold very good, soft and calm machines. But with this new CS8 HL I cant get the AH to do what its supposed to. I hover at 55-60% stick with 3.9kg payload, total of about 9kg. When I hit the AH the bird goes crazy as if I gave it full throttle, like a rocket, rices about 10m in 1 sec, so much power! When I lover the throttle it slowsdown, but not as I know it should do with the fc upgrade and "auto" setting in mk AH config. Tryed alot of different settings at AH config, without success. The HL it selfs are very nervous, not near the other ones with MK BL's. Tired of hunting the right settings, feels like the combo of MK and Herkules3 aint gonna work as well as MK BL's. Last try before I reclaim the H3. Better ESC's? BL's with 5s config? can they handle the current and weight? Any ideas where or what to start with?