Another thought is: A cam that you are retarding to gain top end power, you can pretty well bet (in most cases) when you do this, and the motor picks up on top, you either don't have enough cam in the first place, the wrong LSA for your power range in that the cam has too narrow of a band (or too much ring gear) or the motor is simply running out of fuel due to an insufficient fuel supply. I see this in particular very frequently. So, what does the guy do? He retards the cam to compensate by delaying everything. (shifting the power band up) I feel this practice (in most cases) is Band Aiding the situation and is what I refer to as tuning the motor and cam to the fuel system rather then the other way around. You might be surprised about the things you will learn about your fuel delivery from a fuel pressure guage during a WOT run.
As far as major engine components are concerned, camshafts are realativly inexpensive pieces, but understanding them and what they do is So critical. Perhaps more than any other single internal engine component! I can't say it enough: You get what you pay for. There is so much more then just being loaded with massive advertising Dollars. Sure that will sell cams, but most of the time it is to a guy who likely has nothing to compare to ( it is his first or second Rodeo) nor does he have any real experience. Therefore he thinks he has real power. That guy doesn't know what real power is. Most of the time this Grass Green buyer is relying on some high turn-over rate Tech on the other side of the phone line equipped with a catologue in hand who likely isn't a designer or a builder.