"Thanks Dale, very helpful. I removed some gem fan 3 blade props in favor of some hq bull nose props. Worlds of difference in vibration. The gemfans are hard brittle junk. The hq's need to be balanced but I now get a steady hold. This was on my…"

"Huge bummer on your hex, sorry to hear it."

"Okay. I do believe you've sorted me out. I ignored my concern about the erratic vsi and worked on the mid throttle setting. I've achieved better alt hold as well as decent loiter. Not enough time to do a thorough job but I'm sure I'm on the right…"

"Awesome feedback. After I repair a couple of pins that broke when I hit my ceiling on another failed alt hold attempt, I'll get after this. I'll let you know what happens."

"Hello Michael, thanks for the reply.

I've written a lot here somewhat because you've been nice enough to ask but also it helps me chart my next steps.  Feel free to help where you're not exhausted from reading.

I have the Diatone FPV250 with 2206s…"

"Hello David,

I'm looking for a bit of help or at least confirmation.

I have one of the APM mini pros I got off of eBay. It flys okay except for ALT Hold. When I engage that it bounces and starts an erratic climb or it bounces and starts an erratic…"

"All,

I am super confused by this problem but hopeful there are kernels in this thread that can help me with my erratic altitud hold on multiple APM (knockoff) boards of mine.
I too have very erratic movements of my small quads (2 different 250 size…"

"Problem solved. I had mucked up my ESC programming while calibrating them via the transmitter. Resetting their setting fixed it. Thanks Craig, you got me thinking about the ESCs. Now I need to fix the alt hold problem."

"Somewhat my concern as well. I've removed all the ground and power leads to my ESCs so I've had to calibrate using the FC pass through where it calibrates all ESCs at once (at least I think that's my only option, I'm not an expert on that subject).…"

"I did install earlier but didn't think to do so to get erase, install functionality. Only did it to see if fallback would help. Hopefully erasing eeprom via Arduino didn't break something. Thanks."