Grains mean very little. Honestly, get the mallet out and hit bats and tell me bats with less grains in general dont ping just as good (in most cases). Ive found through a lot of testing ok you dont want 5 grains or 3, but as long as you have enough, around 8 and they are generally even they will be the best, but even that isnt totally important. The best bat ive hit in a certain shop just had standard grains and a huge blemish in the middle which pinged like nothing else.