To answer several of your questions:
My monocoupe with the G26 in it, is the red one. It gets a little confusing when talking about these. Kangke makes two versions, both called the monocoupe 90A. The "90" does not refer to the engine size, its actually the model designation of the real plane. Anyways, mine is the larger red 1/4 scale monocoupe 90A. The yellow one is a 1/5 scale monocoupe 90A.

Anyways, mine balanced perfectly with the G26 up front. I cut a small portion of the lower cowl out for the muffler, which can't be seen anyways. Otherwise, the cowl is intact and the engine mounts perfectly. As far as wing loading, I am not really sure, but it is low nonetheless. The website lists an average wing loading of 21 ounce/sq ft. Mine is probably slightly higher than that because of the smoke system and extra 16 ounces of smoke fluid I carry. I have flown with and without the smoke system, and there is no difference in handling. This thing flies like a big trainer.

If anyone is considering this plane, i would definately recommend it. The quality is the best ARF I have seen. The only negative thing I have to say about the plane is the cheap wheels. After 3 flights I had shredded the plastic rims. Invest in some nicer wheels. The hardware is top quality, in fact I have not seen better in any other ARF. I was so happy with Kangke that I also bought their Waco biplane. I'd be happy to answer any questions on this plane and post pictures if wanted.