I'd also like to add if you sign up for REPAYE then you're effective interest rate is much lower (I think mine is about 4.5-5%), as the government covers half your unpaid interest.
SoFi, to my knowledge, does not offer a residency loan consolidation program, meaning they won't take into account your attending income (meaning even if you do get approved, your rates would be high), nor would you get low in-residency payments. DRB and LinkCapital are the only two banks I know that consolidate loans for residents. With DRB you pay $100/month while in residency.
Also, DRBs rates have gone up. I consolidated my private loans with them when their resident consolidation loan first came out, then tried to re-consolidate a year later when I matched to a fellowship (otherwise they wouldn't extend my in-residency status and I would start full repayment while in fellowship). The new rates they offered me weren't that much better than federal loans, and you lose all the benefits of federal loans. I decided not to re-consolidate, but I was fortunate enough to get a windfall so I paid off all the private/DRB loans a few months ago.
Unless you know you won't be aiming for PSLF, and your salary is high enough the REPAYE interest subsidy doesn't provide any meaningful benefit, you may be better off keeping your federal loans.