I have only made one run on the 30's, I upgraded from 28" zilla's. My bike done well with the 30" zilla's, but I also have alot of money invested in mods to help turn them. Yes I have had many problems running the bigger tires on my bike, busted axles, diffs, ball joints, tie rods. If you ride hard you going to break something.
IMO You will notice a big power drop with the 30" mudlights. The clutch kit will be a plus to help get the tires turning in the thicker mud. your biggest problem will be the clearance issue of the ES model floorboards. The mudlights are not a real aggressive tire so I think you will be fine in most situations.