Shake rattle and roll

If this problem wasn't inconsistent I would throw another torque converter at it and see what happens. Is there any way a balance issue can get worse as the car heats up? The problem is when I first start the car it idles good and then about 10 minutes of driving it starts to act up worse and worse until by the time i park it the entire car is shaking at idle. Checked compression today and it was perfect. Every cylinder from 150-154. Pulled the drive belts off again just for the hell of it with no change. Replaced the alternator just because I had noticed a bad bearing. By the time I drove to the store and replaced it the car was cool enough that when I started it the idle was smooth drove nice with no pulsing.. for about ten minutes...