How many watts is the rhp and what size cage?

I had the same problem, set it to 90 but wouldn't go past 89. I ended up having to put a uth on the hot side and set it to 84 so it would make the inside ground 80 and then the rhp did the rest and only ran on 35% power. Then when I bought a T10 cage I also bought a couple of used pro products ph-12 122w (I think) rhp and put one in T10 and then set the smaller cage that wouldn't get to temp on top of the T10.

Unless you can solve it by sauzo suggestions you will either have to try to exchange it for a more powerful one or use a uth with it.

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