I believe your weights and chart are right on the money. I did all corners and came up with 125 front and 75 and 75. When I sent my numbers to Cruzer he confirmed that they were correct (I was soooooo proud). But, then he told me that he had talked to Spartan and they had told him that they would recommend that we keep 85 #s in the drive and tag. They said we would never know the difference and that if you carried 75 #s that there might be a chance if you were to hit a pot hole that you could seperate the bead on the tire and wheel because of too little pressure. Made sense to me---hence I carry 125 front and 85 on the rest of them. Drove it home from Spartan after they adjusted the ride height and it rode better than it ever has.
Please know that I am far from an engineer type and give this information in the vein of "don't do what I say or do
Just passing on information