Totally agree here. There has been some discussion on this board about the Gravity line’s ability to be customized. Some have commented that it’s not a great platform racquet and that adding weight here and there changes the nature of the racquet.
I've generally found that racquet mods involving weight addition to the handle work well. Mods adding weight to the hoop are much more variable. Some racquets mod better than others. Short answer for me is the Gravity Tour mods well. The Gravity MP, couldn't make it work. More details of my experimentation below.
My present preferred specs brought on by turning 50 (and likely not to change for another decade when I will hit 60) are 340g, 32.7cm(5HL), 340SW - this includes strings, OG and dampener.
I have a couple of GPro's that are right on these specs. My GTour's modded up to these specs have 3g of lead tape at 1200 and 6g of Blu-Tack under the buttcap. It's around 10% short of the GPro in plushness and stability (even with the added weight and identical specs) and the GTour has a slightly higher launch angle. I notice this most when going for an angled flat backhand drive off a low ball. I need a slightly higher angle of stroke to get the GPro shot to clear the tape. They feel really close when swinging and in terms of manueverability. However, the 22mm beam on the GTour gives the added free power I need when stretched or hitting on the run. As such, the GTour is my long term stick of choice for the next decade. (When I get to 60, hello Ti-S6!)
Conclusion - small mods to the GTour work very well to bring it closer to the GPro, with no negative effects on it's inherent characteristics. YMMV.
I tried the same 3g at 1200 an 6g of Blu-Tack under the buttcap as a mod to my Gravity MP's. This took them to 330g, 33cm(4HL), 338SW. Like some others who have tried, I found the racquet changed dramatically. Despite being 10g lighter post-mod than my GPro's and GTour's, the MP's ended up feeling incredibly sluggish and overly polarised. It lost its greatest asset which is high manueverability and whippiness. Remarkably, it felt less manueverable than the Pro and Tour despite being 10g lighter and slightly lower on SW. Go figure.
I generally like polarised setups, so I was surprised to find how unpleasant the GMP became with even such a small mod. I tried adding more handle weight till it was BP 32cm(7HL). Didn't make any difference. Still the same sluggish feel with excessive tip weight. I removed the added weight and it's now used in stock form - 321g, 33.3cm(3HL), 328SW. It plays great with easy whippiness, spin generation and the big advantage of being easy on the elbow due to it's 62 RA. If you have quick strokes, there's plenty of power to be had.
Conclusion - the GMP is not great with mods. Play it in stock form for what it is. If you want something with more stability and weight, get the Tour/Pro - but make sure you check specs due to variable QC! YMMV.
I should mention that if the Tour did not exist, I'd happily use the MP or Pro; both in stock form. Great sticks and if you're an old-school HEAD user like me, will appreciate the plush feel that was evidently one of the design goals for this silo. In the 360+ range, only the Prestige and Gravity have this plushness of feel.