I agree that Maestro will likely outgrow the biting/nipping stage (though Ninja likes to attack and bite toes under the covers, which was much cuter when she was 2 pound baby than now as a 10 pound panther).
Some of the generally accepted recommendations for cat biting are (and anyone correct me if I'm wrong):
1. Make sure he is getting lots of play time in his preferred mode of stalking (does he like laser pointers, wand toys, milk rings, crinkle toys etc). Reward him with a treat for stalking the toys rather than you.
2. Try to have a consistent response from both you and SO to the biting (which it's generally recommended that you say No, remove attention, and give him an alternative)
3. Try not to use your hand as a toy, so he doesn't see it as one (e.g., do you wiggle your fingers at him or tickle him, so he thinks that your hand is part of the fun?)
4. It's not generally recommended to use punishment (bopping on nose, water squirting) for this type of behavior. I think that you are seeing his riled up reaction to this, which may indicate that this might be an ineffective strategy for him, since what you want him to do is calm down and/or redirect attention to something else
5. Get him a kitty friend :)