I use equal tire balancer in mine and it works pretty good, the last 425's I bought were Michelin XZY-3's they were pretty smooth rollin tires and I think we put the 10oz packs in them, I dont know what kind of tires you have but that has a lot to do with it. I dont know if you have the ability to jack your truck up but if you do jack up one side at a time to get the tire off the ground and put something(hammer,rock,board whatever) on the ground as a reference and get it spinning and watch your reference point to see if its out of round, many are and you cant get all the bounce out of them. If its out of round you can have them trued but that rarely solves the issue and it cuts your rubber away so they wear out faster, I dont know if adding more balancer will solve it for you or not but you should be able to use less internal balancer since it goes directly to the out of round, or low area in the tire. As for tire pressure I always run 5 psi under the max inflation pressure as it reads on the sidewall on a steer axle, If your running a front loader you should run at least 5 psi under if not at max inflation pressure I would guess your front axle loading is close to 16-18000 on the road (with a full load) and the 425's should be rated somewhere near 21000 for the pair at max inflation, figure 2500lb drop in capacity per 5 psi of pressure till you get to about 80 then 5-7000lb loss per 5 psi. I hope that helps I tried to get the most out of my tires so I messed with balance and inflation a lot and I seem to have about half ass figured it out after nearly two decades of trying(yeah I started trucking at 16). In my dump trucks I ran 5psi under in my steers unless it the temp was over 90 outside then i dropped 10 psi from max, my drives I run 5-10psi under depending on how they react at each for a week or two then I drop them 10-15 under if its over 90 I found this keeps tire wear even and blowouts to a minimum when your running over 70,000lbs on a tri axle sometimes over 80,000, oops did I say that!