I had a similar issue with my Phoenix Tiger 40 last year, only at takeoff instead of landing. On that day, the wind was from behind the flight line. Not wanting to risk the just repaired airplane (I had a bird strike the previous week and I had just received the repaired airplane), I decided to taxi out as far as possible and then takeoff at an angle to the flightline. As I applied power, I was ready to apply right aileron and rudder knowing fully well that since I was taking off at a 30Deg angle to the wind, the thing would likely roll left. As soon as it left the ground it did just that and I applied the correction. However, it did not correct and cartwheeled. I broke the tail just in front of the stab and had a crack in the fuse. Got it repaired again but it never flew the same again (more jittery after that).
I have since moved on to other airplanes, mostly 3D airplanes so I havent had that problem and I hope I dont again. Guess what is hapenning is that these airplanes need airspeed to fly and if it isint there, the small control surfaces cant recover them.
Today, I just put back stuff in the airplane meaning to fly it in the monsoon as it is the cheapest I have. During balancing, I noted that the repaired wing was heavier and it required 35g wt in the other wing for lateral balance. Also, the tail was heavier than recommended and had to add 21g in the nose. Note that I had already added nearly 100g in the nose last year and this was in addition to that weight. That explains the jittery flying characteristics but isint that a great deal of weight?[&o]
Hope it flies better now
Ameyam