I have issues with rear tire wear as well. sucks...
As to the doors. The hinges on the focus doors suck , in a word. There is some play in the door if you loosen the hinge bolts. You may be able to correct your problem that way. I wouldn't try to "spring" the door with the socket that way.
One of my good friends is a body man, I"ll ask him if he knows any tricks..
Speed is only a matter of money; how fast do you want to go?