A FlyerTalk Posting Legend
Join Date: Sep 2009
Location: Minneapolis: DL DM charter 2.3MM
Programs: A3*Gold, SPG Plat, HyattDiamond, MarriottPP, LHW exAccess, ICI, Raffles Amb, NW PE MM, TWA Gold MM
Posts: 100,369
When upgrades are processed before the airport, the highest ranking elites on the upgrade list tend to be assigned the best seats. As a PM, the OP is being given a seat after DMs on the flight have been assigned. IME seats tend to be assigned from front to back with the bulkhead row last.
I almost always get my preferred aisle (even when there's no isle in my itinerary), but I watch delta.dumb around my upgrade window and try to move myself then if I'm not happy.