E8,
Don't worry about his biting, he's using the only 'hand" he knows he has.
The actual mouth contact should reduce, when he learns he can use
his paws to hold on to play. That doesn't mean that he'll completely
stop that behavior,
It's a fine line he must learn. Understanding that he can hurt you with
his teeth, and your prompting with a "NO", should moderate the intensity
of his bite. I think that an attempt to eliminate this activity, will not
promote a connection with you. So, allow him to do it, just keep it
under control. It's just his way of holding on to you, which is good.
HA, when My Female Becca does this (she's still young) I growl at her !
She immediately backs off, and licks the spot where she was biting me.
I think it's her way of apologizing, for playing too hard.