I have to ask, I think your switchback 212 is wonderfully balanced, but having bought the pack, I liked the cab on the OD100 a ton, ¿what are the specs? is it a 2x12? It sounds wonderful with the 69 Marshall (wonderful cleans, never expected that, then I saw it was from Eric Johnson, and it clicked, love it clean, love it overdrived, stock cab and with others), cab mix and matching gives another dimension to this.
My other question regarding this, I am hesitant to buy your IR packs exactly for those reasons, I do not know how much will be lost from the amp taking out the cab and putting one from an IR conversion. Maybe some magic is lost there. Is it better with the kemper cab pack? I wonder how much do you consider it would be lost, I am in the search for some immaculate 4x12 greenback cab sound with fatthead and a royer mic (gives a very realistic full expectrum of what you may hear in the room in my experience).
I have 2 different 3P cabs I profile with, a 212 Switchback and a 112 Switchback. They do have slightly different tones. In general, I tend to use the 212 with higher wattage amps, but I do profile other amps with it as well if it's already set up. I use the 112 for lower wattage amps as a rule, but again, if it's already set up and ready to go I'll start with it. Like I said before, I've profiled those same cabs hundreds of times and each Kemper CAB I get from it is slightly different depending on the amp being profiled. Every now and then I get a CAB that works on lots of other stuff. I have a handful that I keep saved as presets and if I come to a rig that I don't like a whole lot tonally, I'll swap cabs to one of my faves to see if it sounds better to me. It just increases my chances of liking a rig. Slight changes in mic position from setup to setup or changes made on purpose... these all have impacts on the finished cab sound, along with humidity, actual mics being used, Chinese Zodiac year, etc.
As far as the IR pack goes, I am not sure how necessary it is. I would treat it like the saved CAB presets, in that it just gives extra options for rigs that you may not like as is. After all of these years and having made them, I tend not to use them much. I just usually either prefer the profiled CABS or my saved CABS. I just try to limit my options a bit so I can get work done without disappearing down another rabbit hole.