The HPS pads are made to work at higher operating temps. I've noticed when they are cold they lack initial bite.
I used Stoptech's break in proceedure when I had my '03 Cobra and with my 92 GT with Cobra brakes. The brakes worked much better after the bedding proceedure. I have used both Hawk HPS and Hawk HPS+. If you don't get sick from the motion and fumes during the bedding process you aren't doing it correctly.
http://www.stoptech.com/tech_info/wp_bedinstock.shtml
I used Stoptech's break in proceedure when I had my '03 Cobra and with my 92 GT with Cobra brakes. The brakes worked much better after the bedding proceedure. I have used both Hawk HPS and Hawk HPS+. If you don't get sick from the motion and fumes during the bedding process you aren't doing it correctly.
http://www.stoptech.com/tech_info/wp_bedinstock.shtml