Power window wont roll up all the way

My back driver's side window has never been able to roll up all the way. I've had somebody try to roll it up while I tried to force the window up, but it will not roll up completely. There is a 1/4 inch gap where it won't roll up. It really sucks since I live in Oregon, and well. Its always rains here. So I took the panel off, and took the window channel out and sprayed it down with a silicon lubricant. I put the channels back in, made sure the window was on track with the channels. Still no luck. There is still like a 1/4" of an inch gap that it leave at the top. It makes kind of a grinding noise when it rolls up, also, the window can wiggle to the left or the right. That doesn't seem normal. Its almost like something is pressing up against the window making it so the window can roll up all the way, or the window is not being directed properly causing pressure, hence why the window eventually cannot go up all the way. When the window was off the regulator, I could pull it all the way up to that spot where it is sticking and then muscle it up the rest of the way, but it doesnt seem like the motor can handle that much. And no matter how much I try to muscle it up while somebody else rolls the window up, it won't seal all the way. Any suggestions? Think its the regulator?