Even though I hate tuning harmonicas like a snake, that's the way I do it as well.
Maybe I'm nuts here, but I like to wait as long as I can to tune reeds that are "going south", cause I've always suspected, once a reed starts to go flat, it's gunna go flat again faster cuz:
1. The reed getting older and tired.
2. After tuning, there's gunna be even less material there to maintain the reeds integrity that remains in that little piece of brass.
I've yet to ever have a reed go sharp on me (except for a weird cracked one
) I believe reeds go flat cuz their getting old and tired, and just like us: "age" only goes in one direction.
Yeah, I know, it sounds weird, but I'm a little weird meself.
Age