Agreed. I had a squirrely flight with an F15 motor early on and determined that the issue was with the weight of the recovery gear moving around inside the tube. Basically that heavy shock cords and parachute was sliding all the way back during launch and messing with the CG. I yanked all that mess out of there and added a baffle about 8 inches down the tube to prevent everything from moving rearward. Also replaced that ridiculous shock cord with 1000# Kevlar and 3/8" Elastic cord. Cut the weight of that recovery gear by 70%.
With the added weight of the baffle and the laundry staying where it belongs, I've had no additional issues regardless of the motor I shove in there. Very happy rocket on an F44-8 as long as you have the room to recover it.