I wish I could answer questions, are you disabling the o2 sensor for any particular reason? Many of us have them left on (per his recommendation) and runs great.
The servo thing, I think you have to manually switch it to open and unhook it or something like that.
Idk, I’ve read about people doing it a hundred times but honestly since I didn’t do it, forgot what I read.
Google it using gsxr as search, you should find a lot of info on it. Disconnecting the servo flaps is common for on those forums.
I’d ask but I got banned off the gsxr forums. Lol