I am my guild's RL and we do 10-man normal

I am my guild's RL and we do 10-man normal every week. We are only 4/14 so far but we are still progressing. I take it upon myself to run a flex group every week to help get guildies some gear that will help us out for progression. I have done the first 3 wings so far with many different sized groups, anywhere from 10 people up to 25.euwowgold.com I can't think of any fights that made me think to bring more/less people. Personally I have noticed that 10-man flex groups do tend to be a little tougher. When I look for pugs I only have one requirement...that you have at least 510 ilvl. I use that number because thats what flex was tested with on the PTR so it was tuned around that gear ilvl. I do ask people for their xp in the wings but thats mainly so I know what fights I have to explain and I only make people get in vent if they have never done a fight or if we start wiping due to stupid stuff. My raid comp is normally as follows...