We have put a lot of flights on Comp-Arf flashes here in Kentucky. I started with the down in the elevator as you guys have done. The end result is i have 5/8" from top of wing skin to the top of the spoiler skin. This is a great position for landing flaps and no pitch issues. ( make sure your cg is correct) . I also have a little up elevator at full flaps ( not down) and only about half the trailing edge thickness. This will crawl in with the correct approach.good luck and mine weighs 25.8 lbs dry
thanks Mike Kirby