IME I would say its more critical to maintain temps and humidity within range, doing everything to avoid swings or wild changes in either direction, rather than aiming for specific numbers.
We're growing a weed here, it is highly pervasive, and will grow in just about every environment so long as its predictable. You will find people running low humidity/low temps, and people running the total opposite, both getting excellent results every time and swearing by it.
Proof if you need it of this plants' adaptive nature.
Remember also that humidity and temperature are symbiotic factors in your environment; they cannot be thought of separately.
As long as humidity isn't crazy high and stifling transpiration or encouraging mold, or so low that they transpire too fast (drinking heavy, taking on excess nutes etc), you should do everything else to keep it steady.
If you're fighting really high humidity then you have no choice but to dehumidify.