If 5 DPS is fast kills, but you take too much damage.
And 1 Heals and 4 DPS is still too much damage taken..
And 1 Heals and 4 Tanks is too slow to kill things...

Maybe somewhere in between.
Trying 1 Heals, 1 Tank and 3 DPS, would be my suggestion.

If a two-step approach is not working for macros, you could try a priority based system instead.
Also, without key abilities... some classes are a lot weaker at lower levels, than at maximum.

I haven't seen other Monk boxing threads, so you're one of the pioneers...
Anything that does or doesn't work for you, would definitely help others.