There's just not that much of a difference. Sure, maybe at the top, but that's not where your problem is. I used a map for a Termi slip-on with a full Akra for a few months and didn't notice anything odd. Eventually I got a tune from
@DeussenEngines because I wanted to see what I was missing, and after speaking to Daniel, I trusted his expertise. Bike pulls like crazy, no complaints.
I'd ask if the O2 sensors are still installed. IIRC, the Termi map allows you to remove them. If they're left in place, the bike fights between the map and the sensors for the correct part (just off idle) fueling. If they're removed, no such complication occurs. This was the case with EU4, which had two sensors. EU5 now has 4. Please seek more validation if removing (or test by merely unplugging them) is the way to go. My bike is EU4, as it's US spec. Elsewhere, 2021 was EU5.
By all means try the baffles first as that would be pretty easy.