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Okay, I can't take it any more. The "piston" you keep on referring to are called pin bolts. The rubber pin boot sits over the pins that slide in and out, and the pin bolts hold the caliper onto the car.
You need to check over everything. Start from scratch.
Do like I said above and check all of your calipers for signs of wear and replace if necessary.
You need to release the handbrake and fully retract the rear caliper piston, the big one, not the pin bolts to have the caliper sits properly over new pads.
You need a rear caliper tool. You can use vice grips and pliers, but it's better to use the tool. It looks like a cube with nipples on the ends that go into the slots. You turn it with a ratchet. It's like $5.
Check all of your retainers and clean/grease them up according to the FSM.
For HPS, you need to bed them in per instructions that come on the box. Basically do 8-10 medium speed stops and then drive on the freeway for 15-20 minutes without stopping to cool and heat cycle the pads.
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