Chances are the mesh isn't mounted in the hoop evenly. Considering their use it wouldn't surprise me, as pitch isn't really relevant, only tension, so you can get away with cheaper production method if need be.
That's kind'a what I was figuring. I don't recall having this issue with real heads.
The reason I ask this question is that the first mesh head I had on there was a very lightweight black head marked "Percussion Plus" (or something like that). The new head is a Peace model (no marking) that I got from Drumbalaya.com. The Peace head is
much more robust (I.e., thicker) and comes way closer to feeling like a real head. It's just curious that to different types of heads (even if the same manufacturer, they're a different thickness) would have this same "problem."
I'll probably be getting a 14" floor tom in the near future and bought an extra Peace mesh head anticipating it. I'll have to see if that one has similar issues.
But you're right. For what they are used for, it really doesn't matter one bit. My main concern was not that the heads were screwed up (at $12 a pop or so), but that my snare drum had a manufacturing flaw.
And for anyone wanting mesh practice heads, I'd recommend the Peace heads. They're inexpensive and feel much better than the first set I was using. It's as close to "real drum" feel that I've gotten. Of course, they are also a bit louder than the thinner heads, but it's all a trade off. Hopefully in another 4-6 months I'll have a sound reduced music room and the mesh heads can go into storage....
Thanks,
Corey