Go with the 210 main jet, do a plug chop and adjust to suit.
The CDI on the 2006 DTX (at least in the UK) is restricted. So you won't be getting full power until you derestrict it, even then the performance is still stifled.
Biggest upgrade I noticed to overall performance was a Zeeltronic ignition system.
Vastly improved the performance on my DTRE.