Good, i also have a male panther, around 7months, and i read all sorts of wrong information about basking.
@Beman was the one helping me a lot with my setup, she knows her stuff. And now, that i experienced it on my own, i can tell you that 85 for basking max is perfect. I have 82 and he doesn't even bask under it, he bask under my daylight fixture with a t5 6k bulb that puts out "heat" below 80's.
Also with the color, mine was gray for a long time, sometimes would show colors, but mostly gray. As he hit 6 months he got more colors, but also, a big change was when i transferred him in a bigger enclosure, he totally "lit up" so to say, and showed better colors (he was in a 16x32 cage until about 6 months old) im saying this because i see you have a small enclosure for him and i also read that you're planning on getting a bigger one, thats good.
I personally think it would help him relief stress from being in a small cage and help him "relax" and start showing more colors. This again, is what i noticed with mine, my experience. I could be wrong. Also i see you have doubts if its a male or female. It is a male 110%