That is amazing - great job!
I've heard generally good things about dealing with GL, I'm kinda sad I didn't pick them for my servicer.
I have done successful EEs with student loans; but honestly, if you don't need the immediate bump, I would recommend just leaving them be since they should be off shortly. If you DO go for the EE, Transunion is usually pretty good, but EX and EQ can be really dicey, if not downright awful.
Are these lates more than 60 days? If they're 30/60, it might not be worth the effort.