"...I have the blade plenty tight..."

I've read, though I'm not a metallurgist and can't explain the reasoning, that overtightening blades actually causes them to dull sooner. However, I'd look for places where the tips of the teeth might be hitting some metal somewhere, most likely because a guide is improperly adjusted. I would also look for sources of friction that could heat the blade. I was having similar problems a few months ago on my Laguna 18" saw. I couldn't see an obvious problem so I just started taking the guides apart and giving them a good cleaning. In the process, I discovered that the upper thrust bearing had gotten gummed up with sawdust and resin, and was no longer spinning freely. This had generated enough heat to melt the sticker in the middle of the bearing, and also to anneal the hardened surface of the bearing so that the bearing itself was being slowly shredded by the backs of the blades. Correcting that little issue has improved blade life by a factor of 10, at least.

If the teeth ride on the metal rim of the wheels for one revolution, that dulls the teeth. I found that out the hard way---1/2" Timberwolf blade is toast.

Thanks for the tips, guys. I tend to forget about all the "fine tuning" needed on a bandsaw, so it's possible something's slightly out of whack. I guess that's the tradeoff for the safety and versatility of this type of saw - more setup time.