Check www.racetech.com/. The offer calculators to swap springs and oil weight, or they have their Gold Valve Cartridge Emulator packages. Go to that site, click on Product Search, then select your model-year bike (though they're all the same fork from 2009 to 2017). When I was riding the hell out of mine, I'd always wanted to upgrade mine with the emulators. Never have though as my usage of the bike in the last 6 years just doesn't justify the expense right now.
As stated above...switch the internals. The cheapest way is to switch the oil. Going to a 10w or 15w oil will make a difference. I would start with some oil just to get a new feel. I had a blown fork seal so i replaced the seals and oil with 10w. Noticeable difference from stock. Next time I replace the seals I'll use 15w.