6.25 is great, for me it's the point where the vapor becomes very visible. And it's always great to have some visual feedback, right?
The thing is, during the day 6.0 can work better, and at night 6.5-7.5 can work best for me. That's the beauty of the E-Nano, and vaping in general. It is great being able to select your desired effects with temperature control.
I might be somewhat unusual in that during the day having no sedative effects is usually ideal and at night I need the painkilling effects of the higher temps.
That's because I use cannabis medically for both physical and mental ailments. During the day I need to fight fatigue, anxiety, and a few other concerns. At night I tend to deal with muscle and nerve pain, with the occasional period of insomnia.
If I could I out just use high temps (or smoke cannabis) all the time I would but it is counterproductive when I need to actually accomplish stuff which is the case pretty much every day of my life.
The nano makes it easy to fit vaping into your lifestyle. Tonight I'm rocking 6.5 with the screen pushed back ~1mm. I think that's probably my new ideal setup. Small loads at a slightly high temp, placed further away from the heater. During the day I drop the temp down.
That's just what works for me. Do whatever works for you, the nano is versatile enough to accomodate your needs...