Get the fixed and refi when your credit score goes up and you complete getting loans. You can consolidate private loans, it is just harder. The one's we have looked at are LIBOR + 2-5% and 0-3% points on the best and some percentage slightly above for fixed.
BTW, that rate is pretty poor. PM me and tonight I will send you a link to a list of private loans that my wife found. I think they started at 7.x%.
If it is Wells Fargo, they suck. They just eliminated their web bill pay. They will only take a check by the mail or auto payment. They also will do everything possible to make sure that you do not get your payment in on time so they can charge you a late fee. And after all that rot, they then take 3 weeks to process your check after they receive it (on time). They also like to push that whole "no customer service" model and will illegally call you if they think you missed a payment (called at work and were told that they could not call that number, so they do anyway).