sounds like you have a wire loose or something else is wrong with the dpf delete, you should not be seeing those numbers after the delete. after my delete and before the egr fell off i was not seeing any spikes in egts like it was in regen. i don't see what kind of dpf delete you have but i would double check all the connections first. with just the dpf gone you should see about 850 deg @ 70mph. after the egr is gone mine dropped to about 690.