ORIGINAL: Charlie P.
You may notice that with added and/or excessive down-thrust on a trainer with flat airfoil that when you slow down and try to land you balloon and have trouble getting it to settle. They're designed to climb with added throttle. If you need speed it's time to progress to a semi or full symmetrical wing.
Avistar is a semi-symmetrical wing, take the dihedral out of the wing and move the Cg aft and it becomes a pretty capable sport plane.
The only flight quirk of the Avistar was that on landing the elevator needed to be "tickled" or quickly but gently fluttered to get it to flare. Too bad it did not survive my poor soldering of the aileron control rod clevis (of course with a student on the buddy box). RIP SeamusG
Where did you set your Cg? I don't have this problem with mine, but on all my Avistars the Cg is a little aft of the reccomended starting point, my flares are smooth and gentle as long as my approach is not too shallow.