Here's better Grit conversion chart.
Bowler's Grit Comparison Chart
to Ver. 2
There's Seven pages
1- The Grit Comparison Chart
2- Grit lists for different products
3- Storms Old and New resurfacing steps
4- Radicals ball surface chart, Mo Pinels Skip a Grit and Some Useful Grit Combos.
5- The Bowling Ball Surface Adjustment Table by jbungard
6- And even though it's OUTDATED there's the Ball Surface Friction Calculator (Outdated)
7- The Six sides of a bowling ball chart.