Hmm. When I shift without the clutch (rarely), I find that I have to let off the gas completely or else it'll grind. And it has to be done from about 3500 rpm. But anyway, I don't usually do that. :P
Normally I bring the stick out of gear and press the clutch at the same time, and then go into the next gear while the rpm drops a bit and let out the clutch quickly at almost the same time. But I don't exactly pop the clutch because passengers don't like that. ^_^;
Probably the main thing you need to work on is rev-matching. Even if you shift pretty slowly, it shouldn't wear out the clutch that much if you rev-match properly. (I think.)
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