Wow, great thread, just read all the way through and watched a bunch of the videos.
I have been along for the ride since 2008 starting with the 5708's, had a ton of guitars with of those, a ton with 5909's, some 5310's, a Guitar of of 5815's, and 11 guitars with 5815 LT's.

(3 of the 594's had something other than 5815 LT's in the bridge, 2 Righteous WL 594's with 5708's in the bridge, and a Brian's WL with an uncovered 5909 Bridge, all 3 with 5815 LT's still in the neck. Both of those were great combinations!)
I just scored two sets of 5815's, they are inbound now, will try a set of those with my PS 594 Trem.
I am eager to find a set of DGT pickups, and covered 5909's.
I have had a ton of fun this year with pickup swaps in the 594's with great results, Lollar Imperials in both the regular and High Wind versions, ThroBak Peter Greens, Throbak MC-102B's, and some Kinman Humbucker Shaped P-90's, plus another set of Kinman Humbuckers.
Circling back now to try various PRS Pickups in the 594's...