I have Coheed's former setup...super sentra

....and an issue I'm having is the tranny mount on the driver's side, top keeps trying to pull itself thru the mount.
I notice when getting on it, a very slight pull to the left and when I let off (put the clutch in), it pulls right....more like a shift to the right, very scary after a 4th/5th gear pull...it's a butt-puckering shiftyness, the kind that makes one glad there were four lanes and nobody next to you!
It has pulled the bushing thru the mount and sheared of the edge/collar of the bushing...
I have since replaced the bushing with a new one from Mazworks but I notice it trying to do it again so something else is going on. Any ideas?
Facts again: slight pull left when accelerating, hard shifty pull right after letting off/clutch in at high speed, after hard pull.