First I'm sorry for blasting you with so much information all at once...but you asked! Lol!
I spoke with James at JBS Performance about the same thing.
The guy has the best engineered sheave and combines that with Dr Pulley OD weights and secondary springs made just for him by Eibach ( I went with the purple one) plus he provides the wet clutch slug kit from the guy who came up with the idea.
You end up with the best of all worlds...great takeoff, quicker throttle, and more top speed.
The wet slug kit is easy to do while your in there, and it engages the clutch much quicker which keeps it living longer, reduces wear and tear on it, and keeps the oil cleaner.
I also added a HMF Titan quiet series muffler which has a better tone than stock and it is louder than stock but it's not obnoxious. I also added a Power Commander 5 (PVC) from him and he installed a tune from a dyno he uses.
I got done installing all the goodies last night so I haven't tested it all out yet.
The stock weights were 30g each and the Dr pulley weights I went with are 17g.
Use only Yamaha Ultramatic and Yamaha Polyurea grease...he has those too!
Check his videos out on youtube ,but pay attention to the latest sheave grease video as the poly goes inside the circular hole of the sheave.
The stock air filter is the worst design I've ever seen.
I went with the Uni air filter mod by a different company... EHS Racing.