i have the #5 slid all the way forward after trying several different positions and it definately is the highest power spot. however the egts do get a little hotter. in stock position couldn't break 1200, now i hit 1400. also, i tightened my gov. springs two clicks to allow for a little more "go" room and this seemed to help.
i thought i read that the #5 had a 275hp output? i don't know.
in other words,, just slide that dude all the way forward and maybe you'll get an occasional 4th gear scratch as i do!!!
later, dusty