Looks like you went with a similar path I did at first. I'm also using a divider with a rhp, and like you, the rhp pretty much takes most of the entire ceiling space, making a horizontal thermal gradient somewhat difficult.
I later decided to add a UTH for belly heat so I could dial down the rhp for the ambient only instead of trying to make a hot spot. Prior to that my rhp was making the ambient temp too warm for my liking just to get the surface temps I wanted. The rock furnishings would sometimes be as high as 94 which made me uneasy. Generally you don't want any surface your bp can touch hotter than 92. For warm ambient under the rhp I think it's better to have it reduced to 84-86. Cool ambient is totally fine.
If it helps, this is how I started off. Mine is a T12 with a divider.
I had my rhp set to a higher heat to try and get the inside of the hide to at least 88 (surface was 92), but at the cost of the ambient being somewhere between 88-90 which honestly I thought was TOO hot, especially for a hatching who prefer slightly cooler warm temps.
Here is Tapioca's current set up now with a UTH.
3 hides now, primary matching hot and cold ones are on the bottom this time with his 'spare' on the top of the ledge.
The thermostat probe I placed higher, about 6 inches below the rhp to better control my warm ambient and keep it away from where it could be climbed or peed on, which I was worried about causing temp spikes. My bp HAS tried to climb towards the probe before so better to keep it out of reach as possible.
My warm ambient is now 84-85 with the top of the hide on the ledge being at a nice 88-89. His rock furnishes are no hotter than 89-90, which I feel much safer about. You can also adjust the power % output on your herpstat if you are concerned about temps spiking a bit when the rhp swings at full power. Hope this helps
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