Bit off topic here but I am actually not a big fan of pearl reference bass drum sound and it's likely due to the full rounded over edges. It blooms beautifully but I don't hear the attack of most bass drums.It seems that your slightly confusing experience with 45 vs roundover edges is due to the cheap Sonors not having quality edges, or they're out of round...there's many other factors that influence the sound.
If you take a higher quality shell with a 45 bearing edge, you'll find they do in fact have a larger tuning range. (That's not to say cheap shells with 45 can't sound good too.)
Your Pearl Reference Pures use 3 different bearing edges depending on the sizes. Sharp 45 for snares, rounded 45 for rack toms, full rounded on floor toms and bass. Do you remember which drums were giving you trouble?
Reference Pure bearing edges