I am a 275lb clyde that just received an Indy Fab 29er SS for Christmas. I am running Stylo SS cranks with 34t. I have a variety of cogs for the rear. 16t, 17, 18, 20t. It currently has 20t cog on it. Is this the best cog for me considering that I am in Alabama which is rooty, rocky singletrack with some medium grade climbs and a few short steep climbs that can be hard on a geared bike?