I don't believe there's such a thing as too much unless it's way too much. I don't know how much is "way too much" , or if a bunch is "way too much". Three ounces is not "way too much", in any MC tire.
You will have a problem if you have too little. You only need enough to provide balance, more out of balance, more beads needed. Any over what's needed will simply be distributed around the tire. The recommended amount is somebody's guess as to how much is required to cover a reasonable amount of imbalance. It's not rocket science.
