Batman is right. Listen to him. I also like the CV carb because if the VM is dumping too much fuel in there, it could be washing down the cylinders which, as batman pointed out wouldn't be good for your new piston and rings either.
Your header pipe is, well, who knows. It's oversized, short, and single-walled. I guess I would expect it to get hot and blue. Cherry red, not sure, but if your valve timing is still off, or your jetting is too lean or too rich????
Again, changing so many things at once makes it really hard to know exactly what's going on unless you do this crap for a living. As I said, the guys we see on TV are using things known to work. You are pulling stuff out of your ass!!
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As for the video, it sounds a bit noisy to me. You might need to check your valve adjustment or possibly timing chain tension is off.
* Which is a fun way to say you are doing stuff for the first time with very little experience to work with. DragBikeMike pulls stuff out of his ass too. The difference is he has a pretty good idea what to expect when he does it and I think he pretty much does one experiment at a time.