Are you limited on wing span? Why such a small wing? Without doing any calculations I would increase span by at least 50% and cord by about 25% just as a rough target. Not enough wing area.

I would also modify the tail so that you return about 50% of the elevator back to the fixed h-stab. Too much elevator surface. It is not that you can't have all that elevator but you don't need it. You can have a full flying stab if you like.