Frank, Snooze...
Thanks for the comments. The heat hypothesis makes sense. Especially
if you've also noticed an earlier crabgrass emergence. I've always
noticed more weeds on the edges of the driveway and road, but always
thought this was because there is less soil there and a lot more rocks.
I was (am still a little) hoping there is an acidity issue. I could
adjust my soils acidity... but I can really adjust it's temperature.
Can't hurt to do a few tests. If I find anything, I'll post back.

Thanks
Buzz