So I've been doing some work to my 2000 Boxster, some that was needed and other stuff just preventive maintenance since I didn't have much previous service history on this car.
Had a cel which ended up being a Maf, changed it and no more cel.

Warm starts always gave me a rough idle for 30 secs and misfire code, so changed all coils and plugs, problem solved.

The car has 50000 kms and was now running perfect through the entire rmp range.
Lastly I decided with all this work done I might as well clean the TB, so I did, it wasn't too bad and no excessive oil from AOS that I could see, but now.....it has a noticeable flat spot at around the 3000 rmp mark, mostly noticeable at half to three quarter throttle.

I did the E GAS reset, but no change.
I also read that the caymans seem to have this issue and it's quite normal, but mine wasn't doing it until now.
Any thoughts on this?