michaelt's advice is solid. In addition, with the on/off style thermostats like your Zilla one, I wouldn't set the temperature for anything higher than 90 degrees.
The reason for this is that these work at either 0% power or 100% power. Basically, they run at full blast until they reach their set temp and then shut off until they fall below the minimum temp and then repeat the cycle over and over again. Because of this, they often reach temperatures higher than their set points for a period of time after they reach their shut-off point. You don't want to put your BP at risk for exposure to anything higher than 95 at any time.
Also, as a general rule, there's really no reason to have the temps above 90 anyway. They don't need it for thermoregulation and, if you have less than reliable husbandry equipment, you can put their health at risk.
Now, as far as the humidity goes, there's actually a bigger worry if the humidity is too low, so I wouldn't sweat your 75% reading. As long as the sides of the glass aren't fogging up or showing beads of water and there's no standing moisture your new addition will be fine. Humidity is something that's pretty easy to get a gauge on without a gauge (ha!). Good, full body, sheds are a great indicator that your humidity is where it needs to be. If you start having incomplete sheds, or they start getting stuck during the process, then you simply raise your humidity so next time they shed they don't have the same issue.
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