Your approach is perfectly valid, but so are many others. Here's mine: even though I play BEADG five string (often tuned a half-step flat!) I prefer a cab that has "tight low end", such as the aforementioned Ampeg 8x10. I happen to use the sealed Bergantino NV610 because it's smaller and lighter and I think it sounds better. Anyway: sure, some five string players love cabs such as Acme or Fearful that go down close to 30Hz. And I get it: it can be nice to hear those low fundamentals in the right acoustic environment. However in my decades of gigging, my experience is that those lowest frequencies often cause more harm than good: they can muddy up the stage mix, bleed into the kick drum mic, etc etc.
The reason I have the OmniCabSim high on my wish list is precisely because it can tighten up lows as well as highs. I recently got a pair of neo Bergantino CN210 cabs as my secondary/modular/lightweight bass rig. They are standard ported/tweetered cabs, and have lower lows and higher highs than the NV610... which is fine, but I prefer the tone of the NV610. I would never expect the OCS to turn the CN210s into an NV610 clone, however I would use it to trim those lowest lows and highest highs so I don't get too much low end rumble, or too much high end fizz when I kick in overdrive.
P.S. As a reminder, there's a lot more to a note than its fundamental. I can hear low B just fine through my NV610 even though the fundamental is not present, because the other harmonics are there -- and psychoacoustics pretty much fills in that missing fundamental anyway.
