Thanks for the replies,

I should have been more specific - it ballooned when I chopped the throttle on landing so I removed some of the down thrust which sorted that out.

But in full power verticals it pulls left some much that I need almost full right rudder. It also only has enough rudder to hold it in a knife edge with left rudder.

I have put in a washer for right thrust and will test it.

Is using a mix on the radio an good solution ?

Thanks
Tim