Pixhawk/apm throttle issues

Why prefer x over +?

Those frames are not the greatest as they flex a lot.
So to get the best out of it:
Tie down EVERY cable. If you shake the quad no cables should flap or move
Add some weight to the Pixhawk. There is a whole section in the Wiki on vibration dampening, read it.
To hover inside takes quite a bit of practise.
I assume you are flying that in Stabilise. If not, then you should.
If you were in altitude hold then that, combined with the vibration, is the reason it shot up.
Other than that it just looks like you need to practise eye/thumb coordination.

Hi, you can use good quality double side tape to fix the anti vibration mount. Use 2 layers to avoid the arm mounting Screws.

Hi, I thought it was designed to be X

Ok will read the wiki page
Yes it was in stabilize mode
I agree I need practice to fly it comfortably

Okk will try and let you know