raid layout

I'm playing on my own server, I'm trying to see how fast can I do each of the raids where I complete each expansion's boss fights, then I can move on to the next expansion. kind of like a progression server but I can jump to the next level after I beat the current one.

I like having a strong tank/cleric grouping because I'm usually undergeared. so I have 3 tank/cleric groups, I am looking to fill in the other 6 groups with an enchanter, druid, shaman,mage somewhere in the mix.

velious is where the fights start getting too long for 1 defensive to handle, and I want faster dps. any suggestions for groups 4 through 9?