I've since fried the Lux and switched to a Kakute, but I would try this:

1. Set your minimum throttle percent to 6%
2. Disable Air Mode
3. Update your BLHeli firmware
4. Make sure all of your motors are spinning in the right direction
5. Update Betaflight and try with/without RPM filtering

This phenomena is normal if you arm with props off. With props off, I-term error will accumulate because no props = no movement response = FC tells motors to ramp up in an endless cycle.

OK Thanks for this. I will try it this weekend if the weather is fine. I just want to fly this quad. Been sitting there now for about a month gathering dust.

ShakDiesel, Managed to get it working on the weekend. I had a bit of an issue where it wouldn't Arm. Re-Flashed it and it all works fine. Really happy with it now. Thanks for the assistance.

Glad to hear!

Hey Thanks! I'll definitely have to try this. I've tried 6S on this quad and although it flew well, it was very hard to handle.

BF 4.2 firmware is out on release candidate right now. It's a very stable build that comes with some good upgrades – like better rpm filtering (loop times are very accurate, so you can run D600/8k/8k if you are doing D300/4k/4k now). RPM filters are smoother big time. Devs also focused on smoothing RC inputs. Read the 4.2 tuning notes to set the quad up the way you like to fly. https://github.com/betaflight/betaflight/wiki/4.2-Tuning-Notes?fbclid=IwAR1RKgWOGITLZSdO2G-ZMrwZcQGKqjgCXa_2VlD7lEhQky3pINvmI-m0Pis

It's a pretty easy update but will make your Gecko run much better.

I'm pretty excited to try it out. Really hoping it fixes my issues when using heavier batteries. The quad would flip out when using a heavy battery (1050 4s, 850 6s). After some really painful trial and error, i found that the RPM filtering was the cause, and lowering the filtering frequency made it a lot better. I suppose if I really wanted to get it spot on, i'd have to use the blackbox logs to find the exact frequencies the noise is showing up.

gecko 4inch on 6s 550 batts at 70% throttle limit is now my favorite quad. the most fun ive had flying in years. i rarely touch my other quads now

70% throttle limit? do you do motor output limit at all?

I'm interested too

they were alright, not a whole lot of prop wash but they didn't work well with RPM filtering. I switched to the sliders with a PD gain of 0.8 and a stick feel of 1.2 and it is very smooth now.