If the TIT is too high, there is not enough fuel flow.

High TIT at high power when the engine is working
hard is very destructive. Should be 1350 or so.
To get that, you will have to set the pressures at the
absolute top end of what Continental recommends.

The electronic fuel flow restricts the flow a bit, requiring
even higher pressure, which is not widely recoginzed as
a problem.

Bill Hale BPPP instructor