I fully agree that it is overkill but the weight of one servo is not going to overburdon the plane and in fact would probably not be noticed by the average flyer. I'd rather see the weight there than back on the elevator in the form of some kind of bracket and start cutting up the plane. I also agree that a Y-pushrod would be fine but that didn't seem to be going over too well either. Great Planes has an interesting method of doing a Y-pushrod in the ARF KAOS-40 that works. Are you familiar with it? They just clamp the pushrods together with a wheel collar and run a single wire to the servo. Kinda strange to me but it works.
BTW, I read the review or I would not have referenced it.
As for heavy, it is advertised as 7-8 pound plane and MinnFlyer's came out at 7.5 lb. A different engine may changed that one way or the other but he did not complain about the wt in the review.
That all. I'm going flying