I just need some help with Chamber 12 on the glitchless run. I know I need to be airstrafing to get the extra boost onto the highest platform, but I just can't seem to do it right... Does anyone have any tips?

Thanks in advance!

From what I understand you need to airstrafe in the jump into the pit while slowly turning left. You need to enter the top half of your portal so shoot it fairly late. I've only done it 3 or 4 times so more details might be helpful.