When going over 100 mph, if you just lift off the throttle completely in mine it really flops forward. Not uncontrollably, but it is noticeable.

Easy way to slow down with more control is to 'roll' off the throttle, just like they teach you to 'roll' on the throttle coming out of corners on a track. Imagine you are rolling your foot onto the pedal... don't mash it... now do this in reverse.

Lifting the accelerator pedal slower and not just popping your foot off will make a BIG difference in control.

Cheers!