Yeah, thanks for that. I am well aware of it and have seen it numerous times.
Some may have not so posting it may allow them to copy and paste it to their files for future use.
72Blu was right in that it IS a really old chart that does apply in most cases with most people but doesn't take into account power or manual steering.
I have over 5 degrees of caster with stock UCAs and offset bushings. Some people like 72 Blu have even more and love it.
The point of this thread was to explore a low cost way to increase the caster to well beyond the "skosh chart".