Ok, here's an update. Let me begin by establishing the criteria. I'm using a Sidewinder Force Feedback 2 Joystick. It doesn't have any trim controls on the stick itself, so I use the keyboard to set trim. Combat trim is off. From 17K up, I dove for the groung in a typical Jabo dive, approximately 60 deg down nose angle. At 500+ IAS, the nose would start to climb back to a less severe AoA IF the Y axis trim is set at anything above zero. Also, if at anytime I used any Auto pilot settings, the Y trim would reset positive. So, before I began my last run, I intentionally set the Y trim to below zero or in the negative range on the scale. I achieved a 500-600 IAS dive before any "float" took place, and that was minor when it did happen. Also, I was in severe compression when it finally did occur. Thus, I have discovered something unknown to me before now. If this is old news to some of you guys, then I apologise for re-hashing this. But it came as a total suprise to me when it happened, and I had to figure out what was the cause. Anyone is welcome to re-create my experiance for yourselves, and view my films if you would send me an E-mail. Thanks.