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.I'm confused with descriptions and terminology.
I find my roundover edged drums to have more attack (whatever that means, focus?) and articulation than the straight 45º edges I have. the 45º edges are more open and airy. Like the difference between die cast and triple flange.
The 45º edges don't have more tuning range. The tuning range seems to be related to the drum. I have a set of Cheap Sonors with 45º edge and they sound bangy at higher tunings, but the Nice German Sonors still have a pronounced fundamental at higher tunings. My Pearl Reference Pures don't tune up as well. They sound too clean at higher tunings and then they get noisy when I go a little higher. They can sometimes have a weird overtone that lingers at high tuning.
I don't prefer roundover edges for my typical preferred 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