This question has been nagging at the rampant skate nerd in me for a while now (keep checking to see if Grosso responded).
Further developments: while perusing a 1989 Transworld (as old skate nerds do), I found a sequence of Dave Crabb doing what would generally be thought of as a Losi grind, but rather than kinda nosegrinding in to it, he's blasting like a boosted b/s disaster, but landing "Losi". (Then pushing in off the nose). No caption other than his name, but I'm thinking that might be it.