here is my guesstimated timeline of events...

• 2" drop springs installed
• alignment next day
• 2" springs take a "set" causing neg.camber and toe OUT(i.e. new alignment is now junk)
• tires begin to wear funny
• additional 1" drop added
• tires still wearing funny

check your suspension as 06fx4 L2 has suggested. fix your loose wheel bearing, and any other components you suspect after the checks.

dependin on how long it has been since your last alignment, i would jus take it back to the same place and have them check it again. show them the odd wear and your receipt from last time. make sure you get a print out!

if they tell you they cant bring it completely into spec for camber ask them to make the camber reading even on both sides and add some toe IN. toe IN will help the tires wear evenly when runnin some negative camber.
up to -1 degree camber is acceptable on the street with ~0.20-0.25 total toe IN.