From those jet sizes, you got kit for pre-gen '88-07.
You want Dynojet kit #2193 for '08-12 new-gen.
https://www.dynojet.com/jet-kit-for-...0r-ex250-2193/
Start with mains # DJ100 which is similar to Keihin 102. Do dyno run.
Then use next size down DJ98 and do another dyno run.
You'll find best power with DJ94