I put a Dyna on and it <mine> definately needed a Rejet.
I bumped up to a 150-155 main, did a spacer mod either half or 1/3 or 2/3 (depends on air around you) and bumped the pilot up to 52.5, however recently Ive been contemplating putting a 55 in.
A new clamp would be ideal as the stock is kinda flimsy and in my experience not well suited to creating a good seal.
I feel like a good place for you to start is with the pilot bump up to a 52.5 and spacer, relplacing the spacer with some little washers. Say, 2.
at the same time you could bump up to a 150, or a 152.5 if it exists.
I think the best way to go about this would be to change one at a time and slowly dial it in. Always after a few warm up laps.
start with the pilot, then the spacer, then the main.
then always Adjust your Idle screw.
Serowbot has a really good guide.
I'm just a newb with limited expierience on my bike. But mine runs pretty good with a 52.5, 2/3 spacer, and 155 main. again throught the dyna.
Hope this gives you a good idea. Lancers jet kit is a one stop shop for the jets and washers mentioned.