1. I can see the Marvel Pearl reference being accurate. Glad to know it looks better with the shine knocked off.
2. Each number has it's own characteristics. The letters added on at the end, I'm guessing marketing. I find there to be a bigger jump from 70 to 80 in terms of smoothness than from 60 to 70. 70 used to be STRONG, but now it's almost benchmark. I had suspected that when the Eagles came out, they tweaked the chemical makeup because it just didn't feel like the old S70. The S74 cover is now our upper mid-range cover. Gets downlane easier than the covers on the DCTs, Eon and Contiuum, with more response off the friction. You're not going to get a boomerang look from the DCTs, Eon, Contiuum, or anything else with a cover above S80. Sumo might be a bit snappy, but it's still going to dig in. When I need a ball to slow down fast, I'm using a DCT with surface, a Contiuum, a Sumo with like 2000 grit. Once I burn up a spot, then it's time to bounce off the track I've created with a HB, tactical, On, whatever.