Tip Stall
One solution is to use stall strips on the inboard section of your wing. These will increase the stall speed of the root area of the wing so it is slower than the tips giving you a better landing.
A friend of mine has a Hobbico (I think) Extra 300 ARF .40 size with an old OS .61FSR in it that tip stalled badly on landing. He added pieces of triangle stock about 6-8 inches long to the leading edge near the fuselage. He says it made all the difference in the world. You might try taping them on first as a test.