As far as formation goes, I usually drop my minstrel within buff/heal range and then move on with the champ and pull the mob. I guess you could use this strategy if you wanted to run, say 1 champ/guard and 4 ranged (maybe 4 rune keepers?????). This relies on the hold aggro, so the others can hit strategy. There's a youtube video of someone running 3 hunters and laying out mobs before they have time to get to the hunter group.... As far as strategy goes, I think that's as far as it really gets with LOTRO due to the limitations of the ingame macros system. I have done quite a bit of searching and key binding strafe in LOTRO cannot be done, to my knowledge. Also, because of limitations in LOTRO, HotKeyNet has trouble sending movement to the 2nd pc/window last time I checked. If these problems didn't exist you could use your G15 to say, strafe left 2 seconds on the second character....
I don't know the uses/limitations of innerspace (I really like HotKeyNet), but it may not have trouble sending movement keys in the same way. Anyway, food for thought, hope it helps.

BTW I have two lvl 3 characters on Melendor, I made them when the servers were down the other day.