This is going to go against some of the advice you've already gotten and against what some others here might tell you, because most folks here are die-hard PAM users. And there's nothing wrong with that - PAM is a good product and quite effective.
HOWEVER, it can also be very dangerous if used incorrectly. Here is what I would do:
I would completely gut out Diablo's enclosure and thoroughly wash his hide box, log, and water bowl (and any other permanent deco in there). I would use the Reptile Spray from Reptile Basics http://www.reptilebasics.com/mite-killers and spay down/wipe out the enclosure (make sure to get in all the nooks and crannies). Replace the substrate with paper towels. Spray down your snake with the same Reptile Spray. Do the same thing with your Dumerils' enclosure (even if the mites haven't traveled yet, since they are housed one on top of the other, you have to assume that your Dum might also have them and better to be safe than sorry).
Problem 100% solved in one afternoon.
Here is my experience with mites and Reptile Spray and why I advocate this product over PAM.... I purchased a baby sunglow boa at the Tinley Park expo in October. Found mites on her that first night in the hotel room. Promptly went back to the expo the next morning intending to grab a can of PAM and nuke everything. Fortunately, I had the opportunity to speak with Rich from Reptile Basics before I did that and he gave me a bottle of Reptile Spray and told me how to use it. I sprayed down my baby in the hotel room sink and watched the mites die (and, yes, these were the little hard ones that squished blood and were active on the snake). My baby was instantly and completely mite-free! I sprayed and wiped down her small travel tub and put in fresh paper towels. Also sprayed the other boa I'd purchased the day before as well to be on the safe side. I didn't come home with a single one of these little buggers, the problem was solved in one morning after only 30 minutes.
There are tons of warning associated with PAM and there are some accounts of mites becoming resistant to the chemical. The Reptile Spray is much safer, easier to use, and every bit as effective. I treat every new arrival with this product and I've never had mites take hold in my collection.
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