Pencon, thanks for the reply. Good that you are doing the multiple landings. Yes they are pitch sensitive. Have you put an incidence meter on it? This might be a factor. When you have pitch sensitivity, it can come from wing angles and engine set up. If you don't have a meter try this; adjust your trim to fly straight with power on, then cut the power and see which way it goes, up or down. Usually up. If it goes up, that means that the engine thrust is keeping it level at full power, usually this is the determining factor, it means that you have too much positive incidence in the main wing. Some planes need a certain degree of positive incidence to fly good. Others, you can set at 0'. This means that engine thrust can be set very close if not at 0'.
But, can you see how positive incidence and down thrust can make it pitch sensitive?
One other thing to consider. If the trailing edge is tapered to a point, it will make it pitch sensitive also. You might consider building a new set of flat surfaces. Many planes that have airfoil surfaces need to be quite precision ships to fly well. Some times it just looks pretty but doesn't fly well.
I would not make them real thick on the t.e. What ever the trailing edge is on the H stab then you could taper them just slightly to off set the look and still keep some thickness and stability. Of course, this would be a last resort to replace them.
This bird is set up like the P-51 in that the H stab is higher than the wing. The P-51 is a tough one to three point because the H stab gets in the stall area of the wing at high angle causing it to be hard to control in the three point attitude. That is why it will wheel land better. It will high speed stall easier because of that too.
some bodies got to figure this bird out eventually. You guys have had more trouble with this little pig than most other planes on the market! you might find a you tube video of the full size doing it's thing at the reno air show and see how he lands it. I'll bet he wheel lands it!
Well, enough of my babbling on. Let me know what you find.
I am sure GP has put a lot of research into this and all of their planes but sometimes you just can't cover it all. One always gets away.
Thanks for your time buddy. bird.