stable to me means resistance to twisting. On clay usually I don't need that much but on hard courts vs flatter hitters I noticed some stability issues with the regular vcore in stock form. Tour was very stable but with it's specs very powerful and launchy so I tried to make it calm with 1.30 gauge but the combo didnt work. Maybe vcore is string sensitive.
I tried and reviewed percept 97, didnt like it. It's in "prestige" category but prestige is just better (tour/mp/mp-l/pro > percept 97)
I didnt experience stability issues with the pure aero 98. sometimes with ezones when I add too much mass to the handle.
I hope to try Boom Pro, new blade 98 16x19 and new extreme pro. I guess ultimate racquet of choice series is coming back to town soon