When it comes to GXT and customization I think judging from what I've done with one of my Radical Pro GXTs, I think the results are much better than with the original Graphene Prestiges that I have. I've added 18g of lead to the handle and added a leather grip so now it's got the same balance and static weight as my PT57A which is 359g static and and SW of 333 with OG and dampener. The Radical swings 338 and is of course much stiffer but that being said, it's now a very solid playing stick with serious plow and stability. It's nowhere nearly as plush as the PT57A but IMO it compares favorably with what I remember of the RF97 that I've tested.
Hopefully the new Prestige line responds as well to customization.