2018 Hyper red

I’ve recently purchased 2018 hypermotard, this is my first Ducati I’ve owned, and I’m having issues with it. It has 4400 miles on, stock bike with a akro slip-on and rexxer flash.

When I test rode the bike it starts, idles, etc.. just fine. I struggled a bit with the ride by wire but managed a test ride without difficulty.
One thing I immediately noticed was how rough it rode at low rpm’s, lot of blubbering, popping, stumbling. Once I could open it up a bit, it would hit a false rev limiter between 7700-8000 rpm. At first I thought maybe it was dirty speed sensors and was setting off the dtc. I changed to different rider modes and it did the same thing.
I went ahead and bought the bike thinking it was a bad clutch switch. I looked into that a bit with the wiring and noticed 1 of the wires were broke. I looked up how to bypass the switch, so I did by connecting the 2 wires together and soldering then shrink wrap.
Still does the same thing, pops, stumbles, surges.
I researched more and noticed the bike still had the evap canister as well as ais. I ditched that and still, same thing. I also installed new plugs and a sprint air filter.
I don’t have any dash lights indicating issues
Blubbers, stumbles, surges and won’t rev beyond 8k rpm.
I called the dealer that installed the rexxer and asked about their flash and if they set rpm limits, to which I was told no, they don’t change red line settings.
I also had an email chat with the gentlemen at rexxer and he said he doest adjust rpm limits.

given what I’ve said here, any suggestions?
It also still has the oe ignition coils, which I’ve read, the way to go is with the coils from a 1098, 1198, aprilia, etc.. bad thing is I can’t find them new.