If your technique is "solid" at 235lbs. why would it be so bad at 245lbs.? Could this be mental? I have no idea, but try this: Add only 2 1/2 pounds next time you dead and see how that feels. If you have no problem add an additional 2 1/2 pounds the next time you do deads. Creep up on it instead of adding 10lbs. all at once.