I'm checking out a Christopher bass right now. It had helicore orchestral stings on it before and I put a set of belcantos on. In both cases the E string buzzes a little on the bottom four notes when I play pizz. I'm talking a meaty jazz pizz, so it's not all that surprising, but I've played on other basses with lower action and was able to really dig in on the E without the rattle. The action isn't really that low on this bass, and the fingerboard was just planed before I checked it out. Is this just the nature of orchestral strings? Would something like spirocores be less likely to have this problem?