Hey, guys! I just discovered a new route to get to the goal on 55. You have to do it fast, though.
When you start the level, wait till you at least have minimum boost. Roll forward (no turns) and try to jump on the first 1/4 of the beam with a good amount of speed. You need to land as close to the start point side of the beam because you're going to need to jump as soon as you land. As you land, keep the jump trigger held down. Boost as your marble leaves contact with the beam. This will propel you over that black and yellow wall in front of you.
Aim for the right beam once you clear that wall. At the end of this beam (before the two horizontal beams in front), jump regularly. If you haven't slowed your marble down, you should have enough momentum to jump past those two beams and onto the yellow platform with the two planks. You should also have automatically nabbed the hourglass during this jump. Just remember to start pulling your marble backward in mid air so you don't go past the yellow platform.
When you land, take the left plank upwards to the square platform containing a Super Jump. Roll as fast as you can off that platform (toward the goal) and jump at the edge of it. At this point, your boost should be filled up considerably. You might have to use it for this jump. Then Super Jump and try to land in the goal. Good luck!
Using this route, I went from having a ~35-second time, to a ~15-second time. I'm not gonna lie to you, it's not exactly easy getting everything to work as planned, especially landing the marble on the right beam after jumping the black and yellow wall. Once you get it, though, you'll be ecstatic.