Most modern digital thermostats have a tolerance setting that allows you to adjust whether the furnace kicks in within more or fewer degrees of the set point. I haven't seen a humidistat like that, but I haven't looked for one either. If you can find such a beast, that might be your best option. Don't think trying to incorporate a timer into your current setup is a good solution either. Another piece of hardware making things more complex & one more failure point, although I guess the result of a timer failure would not be as catastrophic as with some of our tank related gear. I'd probably choose Delphinus solution of more or less manual control of the fan. Or let it be, like Steve says, it does the job, don't mess with it.
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