I used gator adjusters on one of mine they work fine . Also the tip stall problem was overcame by running a 20.5x14 or a 20.5x14.5 and adding stab fences to the stabs will solve the problems it has with a negitive G aspect (Going over the hill in a push push pull humpty bump ). I found all of this out while flying this plane last season had over 1700 flights on them. They are a great plane, Algis is a great guy who builds them personally one at a time.
And as Forrest Gump says "that's all I got to say about that"