I have no technique whatsoever for the squirrel drop; I've tried a few different ways but they all seem to just depend on how you hit the pipes underneath. For the tubes, I try to enter the first part gently then accelerate amd throw myself forward a little to make the jump. I almost always trip over the planks on the way out and fault at the checkpoint, but I just got lucky in my good run. With both sections it's very easy to just rack up 5 faults in 10 seconds and ruin all your efforts. I feel your pain.