Thanks for the very detailed list of distance record possibilities, from the east coast.
From the west coast, it may be tough to beat 5AN-891 in Adelaide, Australia (8,230 miles, or 13,255 km, from Grayland) once somebody receives it for a decent stock Ultralight logging. Both John and I received it easily with modified E100's, and it produced audio traces on a stock SRF-T615, but nothing substantial enough to be considered a logging. Kevin's logging of 3LO-774 (Melbourne, Australia) from Seward, Alaska (7,684 miles, or 12,372 km) beat out multiple stock Ultralight loggings of VOA-1575 (Thailand) from Grayland.
I suppose the ultimate challenge for both coasts will be India, or the nearby islands. Tiny stock loopsticks will need a lot of propagation help, for a miracle like that to happen.