Shimming Solid Lifters

[LuckyX2]

Hey guys, I have the tomei solid lifter kit and some jwt s3 cams that I am in the process of shimming currently.

If I understand the process correctly, I have to:
1.) take my measured clearance and subtract the desired clearance from it
2.) multiply that number the rocker ratio of 1.43
3.) add that number to the thickness of my test shim to find the thickness of the shim needed

I was hoping someone could explain the rocker ratio to me though. Will that always be 1.43 with tomei solid lifters or does it change depending on the lift of the cams?

Also, how does the rocker ratio fit into all this? I don't quite see why I have to multiply that in... To me it seems that if I want .006" clearance and have .005" clearance then I would need a .001" thinner shim. But with the rocker ratio taken into account I would need a .00143" thinner shim, correct?

I'm just not seeing why...

Also, it doesn't make sense to me that with this method, loosening clearances become even looser and tightening them becomes even tighter when multiplied by 1.43.

tl;dr: why and how does rocker ratio factor into shimming?