I actually used to have spacer lift. And ran 285 with stock wheels and stock UCA. And it didn't run the UCA. Could barley fit my pinky. But it didn't rub.
As far as balancing. Skip the weights and get your self a balancing bag. It's a bag full of beads that self balance the tire as it rotates. And it looks cleaner without weights. My buddy uses it on his Cummins with big tires.
Dyna Beads is a Dynamic Balancing Solution that continuosly balances the tire while you drive. The amount of material will distribute itself in weight and position dependent on the balance requirements of the individual tire. The result is a smooth, comfortable ride and higher tire life. How can we say higher tire life? Easy. Your tires are rebalanced every time you start up from a stop. Pick up some mud or ice? No problem. Dyna Beads shifts around and compensates for the additional weight. Try to do that with lead weights !
Should You Use Dyna Beads to Balance Your Tires. | Off-Road Adventure