Thanks every one

As far as I know there is not one design on this site that can hover flat for more than a few seconds.
Get the CoM circle and the CoL circle exactly on each other if your using only VTOL or only propellers.
If you are using a mix of different propulsion types, then you have to edit then play test, edit then play test, edit then play test until you get the balance good enough.

CoT, rather than CoL. The CoL still needs to be behind the CoM

OK thanks

You gotta put the COL directly in line with the COM