I finally Got my Tiger moth up last week...
I had Lots of UP elevator.... and was abit jumpy.... adding down trim helped, but I believe you when you say.... ADD MORE WEIGHT>>...
I flew mine with my OS 1.60 twin... I have the AIR-bleed style carb, and it makes for VERY rich midrange... but perfect TOP and Idle...
The Wing transports are a JOKE LOLOLOL ....actually it took me A LOOOOONG time for field setup... as I removed the RED joiners ( the wings kept tipping over and twisting....
it was VERY frustrating.... I will do the mod that the other Gentleman listed ( use flying wire to hold wing from falling forward, or modify the wing joiners...
Other that that .... It was a great flying plane...
I am HAPPY to see, that CG can make the RIGHT direction change =(no elevator)....
Perhaps I will just add a saito 325 5cyl Radial and make a round cowl? HMMM....
It would fly great, and sound great, but would look awfully odd wouldn't you think?