I'm very similar and have always had a maximum of 9 grains, and have never had problems (played minor counties, and a grade in Aus). My personal opinion is beauty is in the eye of the beholder, and you will get some bats that go against the grain (excuse the pun) and perform well from the outset and have only a few grains, and vice versa.
I think the pressing, handling, and feel of the bat are more important that the grains, just my opinion though. I also think it's a lot to do with technique and mental approach, and what works for one, may not work for another.
I think JM is saying that the best allrounder would be a bat with "average" amounts of grains, whereas if you have a bat with more or less grains you just run the risk of getting a stinker or a belter!
For me it boils down to with a bespoke or hand made bat you know is made for your requirements, is more likely to fulfill your needs than if you take a chance by going for something that just "looks" good. However I'm not sure if there has been any scientific evidence to show that the grains actually affect the "ping" off the blade? I guess if there was evidence that a higher number of grains makes the ball rebound better then that would settle it? My feeling is, grains are more about aesthetics, i.e. looking good