Hi Roger:
A couple of general thoughts:

- Good and consistent landings are the result of a properly balanced model and a correct landing technique. The use of exponential doesn't fix a any of this. If any, it will make things worse.
- Tail heavy models do not want to land. They want to stay in the air until they drop.


It is hard to advise on your situation without seen the approach, so I may be just wasting your time. But in general, I will say that you may be approaching low, without a good and constant rate of descent, and not maintaining the nose above level all the time. If you are trying, but the model doesn't want to get on a good rate of descent (nose high), then you are tail heavy.


I would suggest: use as little expo as possible (say 10%), and move the CG fwd.
Again: general comments. Don't know your particular set up.

Jack