I've tested around with the dropskip in chapter 6-1, and managed to improve greatly upon it.

Klemmy1 thought he had to go back to activate the trigger, in order to be able to progress through the thunderstorm, but it turns out it's even more advantageous to not do that.

Link to the skip:

What i do here is i use the double crouch to vault over an invisible wall in the place where thunder leaks through. This takes you to the elevator room, where normally there would be a fight, but since you didn't hit the trigger earlier, it's now empty. You can then enter the empty elevator shaft, and sorta mush to the back corner, wher you have to double crouch again to drop down. it's important here to use the slide to go to the back wall of the shaft, so that when it opens up to the floor below you can slide onto the ground, which completes the skip.

The time for the entire level is now about 1.30, even less so if everything done perfectly, half of the current best time.