Peter GoldSmith wrote a great article on how to trim any (not just IMAC) plane from start to ends. But unless I'm very stupid, he never discussed Down - or up - Thrust.
www.mini-iac.com/Portals/57ad7180-c5e7-49f5-b282-c6475cdb7ee7/PGoldsmith%20on%20trimming.pdf Personally, I run 0 degrees vertical thrust on a 3m Extra w/DA-150, slightly tail heavy so manouvers are 'crisp'. Would love to know how other's tackle this one. cheers sleeper