nothing wrong at all with upgrading. Look at all the aftermarket parts out there for rifles, pistols, muzzle loaders, even Bows. Then you got aftermarket parts for $60,000 trucks to make them perform better.
CVA used the rubber grip panels for better gripping in foul weather. Anyone that has both a V1 and V2 normally will tell you that the V2 feels better with the extra grip. I like my V2 better than my v1 due to just the grip panels. It really helps in cold weather.
My favorite bullet is the Thor. I love the fact that i can use an easy recoil 250gr bullet and go after elk without any worry. Cant do that with lead.