I had a similar problem with a trainer once, I had so many landings that placed stress on the nosegear that it caused my rudder servo to develop a problem. When I would take off it would bank hard left. I determined the rudder was causing it to bank because the nosewheel was forcing it to turn. I replaced the servo and all linkages to the nosewheel and ruder and it was perfect again.

Could be a weak servo or control rods causing all of your problems.

let me know what you find out.

good luck

The 2 problems may be related. On take off are do you have to feed in right rudder to keep the plane tracking straight down the runway? If so, then your nose gear is not centered with hands off the stick. This means that when you take off you have right rudder inputed and thats where the plane wants to go. I too have this problem from time to time and have to readjust the nosegear to track straight. This should be done on a flat smooth surface. A driveway or carport works well. With radio gear on and and hands off TX (make sure trims are set for hands off flight) push the model. If it turns left or right the gear is not straight. Adjust the nosegear untill it rolls straight with hands off TX. That's my 2 cents worth.

PDuck