I installed today the latest OB Patch and did some flying with the AH-64D testing the FM changes.
I really like the changes done to the FM, especially with FT interrupted while FTR pressed and hold. The AC is much more stable then and it makes maneuvering with FTR pressed much better.
I confirm your detailed report, though haven‘t tried aerobatics with the changes, but will certainly try some loops the following days……