+1. Replacing a damper with a hunk of metal (though lighter) doesn't do anything good for the car. Considering how sensitive the cars knock sensors are to even normal vibrations, I'd imagine any type of logging with an AP would probably show your car is pulling timing due to false knock caused by the lightweight pulley (just a theory, as always, without logs...).
Replacing it with a superior designed dampen is the way you want to go. They have shown decent gains on the mk6 with the fluiddamper. No real info on the mk7.
Regardless, looking at minor increases. Outside of tune, (IS38), intercooler, and DP, everything is relatively little gain on these cars. (lotta money to get an extra 5 or 10 hp).