sorry cafeenman, not trying to disturb your thread. I'll throw in my $.02 worth on your problems.
1. The snaproll problem on full aft elevator is caused by the dowl rod used to connect the two elevators. Under heavy loads with one elevator being driven by the servo and the other being the slave via the dowl rod, the rod is giving under high loads causing uneven elevator displacement. Since you have already installed the rod your easiest solution is to thin CA soak the dowl rod to give it strength.
2. The landing gear can be put on wrong. I bolted mine in backwards, then I saw that one side was pushed back and it was obviously on the wrong side and the gear did not sit flush in the gear well box.. Or it is possible you could have gotten two of the same side gear struts. What threw me was when they were on the correct way was how much negative camber there was. After several landings the gear began to relax into a more normal position. The negative camber in the landing gear forces inward pressure on the mounting surface rather than when you have positive camber, the strut can pull down on the mounting surface and cause the box to break.
Work with it you'll get the problems solved and it will become your favorite plane.