been dutching for sometime & made not too bad a fist of it, however as with any methods it always comes back to your selection method(s), if they hold up all is sweet.

you may want to consider setting a minumum price about your shortest nag, say 3/1, which should assist in you never having to bet into an odds on situation.

maybe also consider a reversal of the standard way of doing things by having the larger share of your total bet on the longer priced nag(s) & less on the shorties.