I had a Midwest Cap 232 with Zenoah G45 and experienced the same stalling characteristics on landing. What I observed was that the plane was fairly heavy, probably approaching 17-18 lbs, and it was a matter of wing loading. The Midwest planes build heavy compared to the latest ARF's. I eventually changed the engine to a BME 44, which is considerably lighter than the Zenoah, and this helped somewhat.

You didn't mention the weight of the model.

I know that there is no quick fix to reducing weight, but this may at least explain the problem.