I use G3 for the Vcore89.
...used grip 3 with the Wilson BLX PST 90, K90, K88, etc. Same with Prestige mids and all other racquets I've mostly owned with 2 exceptions. Radical midplus at G2 and RDX 500 mid at G4 (because they we're out of stock at the time); I'd rather go for G4 instead of G2 but I find G3 to be my perfect grip across grip shapes. G3s on my Vantage racquets too among other brands I've had.
It is better to have it and not need it THAN to need it and not have it!
Tour 89 Lux Alu Pwr @60 Lbs. X-One 17 @65 Lbs.