Ohm load my guy. I highly doubt you have the exact same nominal load. Then again, maybe you do.
What is your nominal load, and what is his. Report back.
If your amp isnt going into protection, i highly doubt its "just not putting out the same".
What is your nominal loaf to each (5 channel right?) And what is his..report back.
Really it doesn't matter too much since its not going to change anything else in your system so its more on your preference.
If you tuned your amp with the 8db overlap and you want the vu-din to light up red when you start to clip your amp then use a 8db track.
Some people may not want to see the red light up at all and will back off the adjustment just a little bit so it only lights up red when you are going in to hard clipping.
Where as others will set it up so that it hits the red mark a little before you go in to clipping.
Play with it a little and see how you like it for yourself.