lads the tyre is a Spring damper and will throw of the readings if the ride height becomes uneven which shift the cg left right front rear of the design static C.G.
Ideally the process of corner wighting is to first set your sprung mass up by using a non deformable wheel at the correct ride "ideal" height as the springs are not pefectly equal length or rates even if they are "matched" and the damper seal friction can cause issues.
Then put your race wheel and tyres inflated "hot tyre pressure" using the same guage to race pressure on hopefully matched to eliminate stagger and ovality. Then check your race height because the walls on the tyres do not deform equally under static load you will see that the corner weight will get thrown off. if you have "perfect " wheels and tyres you won't
Take the tyre AND wheels off then adjust the ride height on the solid wheels to and recheck the corner weights.
This will eliminate the varibles that you can control from the variables you can't control.
but it is expensive and time consuming to do this and a 7 post rig is the better faster option and will fine other issues such a sieazwd CV joints a wheel stiffness deflection etc..
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