I need help in this part:

THIS is my problem: I am supposed stay on one tube (what I'm doing at the moment) and jump on the large one on the opposite side.

This used to work (I finished DK 2 times). Now it doesn't, I tried about 50 times. Neither works a Shotcycler jump. Am I too stupid?
Another thing: Mishima Guards seem to be too fast with Dual Core CPU. They get from A to be in NO time (plus instant hit -> carnage). Simply deactivate one CPU within the task manager, that worke for me.