Replacing big ring with bash guard has proven many times to be a great upgrade! Cheap and very effective.
This may be a stupid question, but did you do anything to stop the derailer from trying to push the chain off the second ring in the event that your mashing through gears and accidentally try to shift to the third ring?
Im doing a similar mod with my bike but im adding a chain guide with a built in bash and deleting the third ring, instead of just swapping the big ring for a bash ring.