For my Wilwood setup (13" front & 11.75 Rear) on the street I use Hawk HPS on both the front Wilwood FSL caliper and rear OEM caliper. They have been good for over 50,000 miles. I switch to Wilwood B on the front for the track.
In the past I also used Hawk HPS in the front and EBC Green in the rear for the street. Again I just changed the front for the track.
I do not see any problem having a different pad in the front than in the rear. I suspect any basic pad will work fine in the rear. The rears do get hot in the rear when pressed hard (track use) so a good rear pad is still important.
I have had the rotors turned (to remove brake pad transfer) by a local brake shop with the hats still attached to the rotors so there should not be a need to remove hats to get the rotors turned.
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Good to know I can just leave the rotors on the hats for turning. I think that's what I'll be doing so I can get new pads all around at the same time.
I also think that given the fronts do the heavy lifting, there's no huge issue if there's a different pad in the back as long as its performance envelope is meant for the expected use (street in my case), although with turned fronts, I think I'll just go for new pads this time, and when those are done, it's new rotors all around anyway.
thanks