Whats your over clocking settings though? Lower TDP on the afterburner doesn't always equal lower hashes if combined with other adjustments.  When you overclock the core with 55% TDP limit applied you are basically undervolting the core.  Thats why you get:

e.g. 260h/s at stock settings @  62%TDP on a 1060 3gb  62 degrees
and 263h/s at   +160 core +400mem @ 55% TDP on the same card.

Also in nvidia inspector P0 mode forces better performance.