I would advise you play the 0.10 rebuy on Full Tilt as well.
Don't be anxious to play with better players (like you mentioned).
You should be glad to play with people less skilled than you, and
you are sure to find people less skilled in these 0.10 games. Oftentimes
you will invest alot of time to win very little, but your BR will be steady,
and after alot of attempts you may actually win a decent prize. Also,
don't rebuy or add-on in these, it isn't worth it. Wait for premium hands and hammer at the people playing garbage. These only run once a day, so you can play freerolls
as well. Really, 55 dollars isn't much to safely build a bankroll with.
***Pokerstars does have much better micro games. I deposited $28 one month ago, and have built it to $54 following tight BRM.
Really, I think the only good way to build a BR online is likely cash games, or consistently playing micro mtts with the hope of winning the $50-$250 first prize once in a blue moon. I suggest you preserve your $55 playing the 0.10 daily mtt and freerolls, and if you are looking to win big play the $1 daily dollar.