In your case it may of been worth getting the barrel checked over, as from the video the knocking is pretty loud! Much better than before though really depends on how long your looking to keep the bike and how much you want to put into it!
My bike ran well after the top end was done! loads of power until the coil decided to pack up and god knows what else so now that's been replaced its back fighting fit! Got to say its amazing the difference!
keep us posted on what happens!