I know a lot of people rave about them but I was never particularly impressed with my Freezer 7 Pro. From memory my idle temperatures were around 18ºC above ambient. I replaced it with a Thermalright Ultra 120 which has a decent retention system although it does require motherboard removal to fit.
After saying that I also had to remove my motherboard to be sure that the pushpins were fixed correctly on the Freezer Pro as I found it was to easy to 'splay' the white plastic mounts.
I have also noticed slightly better results with Artic Silver thermal paste.
1.36V is reasonable but you may be able to run it at 3GHz with the same voltage it requires for stock settings.
My VID is 1.3125V but requires 1.43V for 3.3GHz which results in the temperatures i mentioned earlier.