Awhile ago, back when PoFire kite was leet and no-one could tank tables in exp (yes, a long while ago) what we used to do was put 5 bots at the zonein, and 1 kiter at tables. They used to recieve all the bonuses of having 6 people in the group (as there are bonuses) and since people were OOR, they never had to share any of it. So it's solo EXP, but with grp bonuses.
I haven't tried this in awhile, so if it works still, you'll have to let me know.
Note: Just leaving 1 person OOR won't do anything. the 6th person adds a bonus, 5 people make less exp then 6 people. It's pretty much full group or nothing.
Technically you could /warp succor right before the kill.