You've found out that you're pulling too much elevator. That's often the case.

What you might also discover is the elevator throw can be reduced a lot. I've had a couple of Tigers and a Calmato (tiger knockoff) and all of them flew much better (and safer) with dual rates set on the TX. Setting low rates and using them on the elevator is really worthwhile for most flyers. With my 3, around 50% for low rates made landing much smoother. That was after I'd adjusted the high rate by flight testing.

Flight testing showed that all 3 had more elevator throw than necessary when set as recommended in the assembly instructions. Throw affects how sensitive the plane is to land for one thing.