U of T's funding formula was the primary reason I decided to go elsewhere. I spoke with a number of administrators and faculty and there was no room to move. When I declined the offer I was clear that it was the primary reason they lost me to another program. Other universities have been much more accommodating. That said, I would absolutely ask and if you have another offer that does not claw back make sure they know about it. I have asked for and received, in writing statements from graduate studies and program directors that there will be no claw backs now or in the future to my funding packages.
