That might be optimum if effort is the only blah blah blah, but not if the ratio score/effort is the I can't believe you actually took time to write all this.
I suppose a lazy person might give a damn about trying to balance PRT score with effort exerted, but that's more of a subjective decision. I'm just giving an unbiased analysis which assumes that I spend more time theorizing about running than actually running.
STFU and just go run.