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Unfortunately, these are cheap, lightweight, import quality products.
You can check that all the teeth are approximately equal, but expecting to get good results from an $8000 mulcher compared to the major brands which sell for over $25K is probably asking a lot.
Ditto on checking with mfgr. regarding belt breakage. Speed of drum vs. obstacle bulk will affect belt life. Check that the pulley shafts haven't been bent in handling. Possibly search for a kevlar belt. Specs say it will handle an 8" tree. That might be a pine or fir tree and not a hardwood. Good luck.