RE: YS-170CDI Flight Report
Woah, you need to secure your engine dude! That thing is all over the place! Accident waiting to happen....
That's first and foremost before you start messing with anything else. #1 safety, #2 it can cause problems that will make it very hard to diagnose the real issue.
Edit: looking at the video again, it looks like you just might not have a nose ring. Is this the case?