Agreed, and with a bit of additional research, you can find supporting evidence for the majority of that article. I find most people who think they're just trying to dodge warranty claims are people for whom the article's content is a bit out of reach.

With a mildly modified engine and a 7500RPM redline, I think you're going to be fine either way. Mitsubishi trusted their balance shafts to do 7500RPM all day; I'm tempted to agree with them.

Finding the cause of the existing problem is an excellent first step.