I'd definitely go get some more soaker hoses for that bed if I were you. You'd have to run that oscillator all day to keep melons going in hot weather.
First, you'll use a lot less water especially when the weather gets hot, because you're not spraying the water up into the air.
Second, it won't wet the leaves of the melon plants when you water with the soaker under the frost cloth so they'll be less likely to get fungal diseases.
