Open Question: Cosigned loans, credit score?

I've been discover of edifice for 2 eld now, and hit been employed and regularly stipendiary my enrollee loans, on line to effort myself discover of debt. I cosigned for a few of my brother's enrollee loans (Sallie Mae loans) because he didn't hit a assign story correct discover of broad school. Fast nervy from brother's underclassman assemblage to me checking my assign inform now. While my enrollee give debt is steadily feat down, his loans are ease in deferment. For Sallie Mae enrollee loans, this effectuation they are gaining interest. So when hunting at my assign inform (Equifax), my broadcast loans assets is prefabricated up of my federal enrollee loans, a give for my car, my Sallie Mae loans, and the cosigned loans. The difficulty is that modify though I'm stipendiary soured my loans on instance (more than the peak on the highest welfare evaluate even), the welfare increased patch I was in college on my Sallie Mae loans patch in holdup and the welfare existence increased by my brother's deferred loans has caused my debt-to-credit ratio on the assign inform to be 102%. How seriously does this change my assign score? Is there some artefact to mitigate this gist likewise continuing to clear soured my debts as apace as possible (which I organisation to do anyway)? My brother is ease 2 eld from graduation, so he can't do anything most his loans. Does the 30% conception administer everywhere, or meet to revolving (credit card) debt? It would be delusive to shoot for 30% on my enrollee loans correct discover of edifice (I mark with around $70K in enrollee loans!).
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