well the other thing that effects the numbers is how the valve is setup. i have a ult with all the shims, and a super soft lvl10. this is not the most efficient setup and practically yields the same numbers as a normal X. but not beeing able to get a 4500 fill pretty much stops me from adding numbers to the data.
i had no problem installing the insert i did it with normal hand tools. put a couple little scratches on the powertube that i cleaned up with fine sand paper.