The key is whether the overall price - the price you pay + the clawback - represents a fair market value.
If it does then the bigger the clawback the better. Otherwise the big clawback simply represents a bloated council estimate and will prohibit you from ever achieving a profit even if the market was to increase substantially.
A big clawback on a fair price will insulate you from any price falls.
A big clawback on a bloated price will insulate you from any price gains.