Hey Trevor, I'm a newby to the forum but not to pop ups. We recently sold our 1994 Starcraft Starflite of 8 years enjoyment and bought a 2009 FR Rockwood Freedom 1940 LTD. I love the upgrades with this FR. Especially the electric lift.
What I have found is that the lift rods ( poles ) on this FR are not as sturdy as was the Starcraft and allows for minute side shift variance. With this Pup we rec'd 2 lifter support corner brackets, whereas the other we never needed them. Just a guess, but unless you are not on pretty level ground this may be causing your "pulling" problem, resulting in your door problem.
We also use the sidewall support brackets for our awning and have not noticed any pulling. Actually I was impressed as too how little the awning actually does pull, as this was one of my concerns of having the awning primarily attached to the pup itself.
My only complaint, actually not with the awning itself, are with the attached nylon ties inside the bag. They are very cheap and I have already ripped 2 of them off when securing the rolled awning.
As HONDAMAN174 had suggested, the hardware shop would be the best to look for plastic feet covers. That would be my 1st stop as well.