I did some test myself awhile back & things worked out as i expected, unfortunatly i am overhauling a couple of pc's for various reasons & dont have my Harddrive, & power supply needs to be purchased so i dont have those results.

I was wondering however if the clusters u used where all the same lvl because i used clusters that were all bigger than the imps i built.
If you got that so as i can take a look see 8)