Right. I'm not really needing the best stagger I'm more so needing the rim size to get my stagger. I'm running a 36 1/2 on rr 35 1/2 on lr and both fronts are 34 3/4 on 6 1/2 inch wide rims. I put one on a 6 inch rim and it didn't change it
just to get on the track and get some seat time:
Put the biggest 36 1/2 on the right rear
the 35 1/2 on the right front
the 34 3/4 on the 6 1/2 inch rim on the left front
the 34 3/4 on the 6 inch rim on the left rear
If he/her is loose or spinning out all the time first try swapping left side tires front to back and/or let a pound of air out of the left rear tire
if it won't turn first try letting a pound of air out of the left front
>>>the important thing to learn doing so to fix either problem is the realization what putting more grip to either the front or back does for you<<<
Next i'm sure you'll be wondering how putting grip to it left and right front or back does for you over adding grip front or rear.
Getting a "feeling" for that will be worth a lot more in learning then worrying about hitting the stagger right on for given track circumstances.
... that will come with time
right now for you it's about seat time, seat time and more seat time
... i'm sure i'll be corrected on here if this idea is out in left field. ...