Not sure about the 09 cvo but the 09 RG's came with 13" air shocks. So if you do switch , I'd be looking for 13" adjustables. Don't think you'll like the 12" if you're not happy with the 13" .
Like RGKEN said, make sure you haven't got too much/too little air in the ones you got now.
2010 FLTRX , Stage 1, 13" Madstad, Mono tubes, SuperShox, Heritage style bars. Alpine CDE-HD149BT,Soundstream Picasso Nano Series PN4.520 , 5X7 and 6.5 Infinity Kappa speakers
If I have to explain ,you wouldn't under stand anyway.