No question Corbin have gone downhill. Even at their best, not all their seats worked for everyone on all bikes. But once Mike Corbin started drinking and got into electric cars ... (10-12 years ago) it all went to Hell. I don't even know who is running Corbin today. BTW, all Corbin seats are heavy like lead.
Corbin's real craftsmen at the factory have always been the Mexican Horse saddle makers. This is most likely still the case. Corbin recruited Craftsmen from Mexico over two decades ago, sought them out. Some are very good, but getting fixes is now nearly impossible as there are no intermediaries that follow up for a customer. Only way is to show up in person.
I've tried several bikes where I hated the Corbin seat. VTR1000, VFR800, GTS1000 Yamaha, and probably a few more. But somehow they got lucky on my DR650. It works pretty good. On my buddies Vstrom is was good too. I had a Corbin on my XR650-L and it was OK too. But I did not get on with the bike that well, sold it off after only a year or so.
A good seat man can literally save your Butt by just using better quality foam and doing the right shape on your stock seat. BTW, I love my leather covered Corbin. Holding up well at 32K miles.
Still, I think it's worth it to pay someone with some true expertise in seat making. It's a real skill.