I was in a similar situation with having a TON of TL's for AES and Sallie Mae loans after college. Though my situation is not exactly the same because my loans had defaulted. What I did was consolidate them with Direct Loans. They purchased all of the loans off of both Sallie Mae and AES and consolidated them into two separate TL's. So the amount transfers to two total TL's, while the rest are displaying satisfied w/ $0 balance (though there are major lates on the original TL's). Also, they purchased them off of the original banks so new TL's popped up as being satisfied and current in good standing, which I would think was good? It's been so long, I honestly can't remember the impact on my scores. But it was so early in my credit repair journey that I HAD to do it. Sorry I can't be more help.
Thanks for sharing your story. The more I read about consolidation, the more I am leaning towards doing it. Now I just need to pick the best place and move forward with it. I just hope that it doesn't hurt my score at all, but I can't really see why it would.