Well, I would imagine the numbers of us are fairly low, so I suppose I am obligated to answer the call : )
As you know, my pair of Pseustes is poecilonotus, but I would imagine they are pretty similar. Right now, I am housing each of mine individually in a 4 x 2 x 2 animal plastics cage. My substrate is astroturf (indoor/outdoor carpet)actually. I have my floor temps set to 87.8 degrees F for the warm end of the enclosure. There are a few warmer spots because of the AP cage floor heat. My cool ends are set to 77.7 degrees F with a 3.3 degree night drop. My probe for the cool end is actually set under a basking shelf, so the floor temp is a bit cooler, and when the light is on to increase my cool end temps, the snake can use it (however, it is rarely on). (also, you can ignor my OCD on the tenths of a degree)
The cages hold good humidity, so I do not mist too much, but they do like to drink off themselves when misted, so I try and make a point to do it a little more frequently than I would need for humidity. Actually, it does not appear that lower or higher mimidity levels really affect their habits much.
One thing I will certainly offer is that they do not do well with larger meals. They will on occasion take them down, but you have to make sure when they get a somewhat larger meal, they are kept under extremely minimal stress. I have delt with a total of 4 regurges between my two Pseustes since I acquired them. I have probably delt with less than 4 regurges in my entire life with any kind of snake. EVERY time included the two ingredients of larger meals, and slightly higher stress levels.
Also, they like to go up to seek security on branches after meals. Large meals do not really help them.
My pair also bluffs a lot when feeding, but they will eventually take the food after lots of strikes. Keep still and do your best not to disturb them if yours are the same way. I have had some luck leaving food in the cage with them, but not all the time. If you want more details on my feeding records, I record times food was offered and the weight of the food. I add notes I feel are helpfull for the next feeding.
Also, my Pseustes are no longer on exhibit, but that is a much much bigger story that does relate to the Pseustes, but is not entirely about them. I am not going to bore people with that story over the forum, but folks who know me can contact me about it.
Sorry for the long post, but I hope these things help you with your Pseustes. Congrats!