If you havent looked already go over to Grizzly Central forums.
All sorts of info from secondary springs, coop45 mod sheaves, primary shimming, wet slug clutches, hunterworks and more.
Cheapest mod would be to throw in 1.1mm of shim on the primary, really helps the low end for like $5 but you will lose about 5mph on the top end.
Are you running oversize tires? What is your riding style, what do you primarily use the ATV for?
The clutch weights will not give you a lower ratio right off the idle, in order to obtain that you would need to either run shims or machine the primary sheave.
Mods like clutch weights and the secondary spring will affect the CVT ratios in the midrange the most.
If you do change out the weights I wouldn’t jump from 30g to 16g or 18g weights. Kodiaks usually come with 28g or 30g depending on year. Grizzlys come with 16g or 18g weights. Personally I like the feel of running 22g weights with the Purple EPI spring for mid range pulling power and then I have the Coop45 modded sheave for more reduction, but I am turning Growlers that weigh alot more than stock and are about 27.5″ diameter.