I find that my modified mel's mix drains well enough that I am watering every day. We have temperatures reaching 100 degrees and wind off and on.
Do you find having to water your daily?
If you heavily mulch, that cuts down on the need to water. For a bed that is mulched, I have to water everyother day or every three days. If the bed is not mulched, I water almost every day when the temps are 90+ degrees.