Nice! Diablo has some really nice coloring.
One thing that worries me a tad bit is that boas don't generally soak. Are you 100% sure he doesn't have mites? I don't mean to get your knickers in a twist over mites, I'm just concerned about it because I know you picked him up at an expo and many snakes coming out of an expo can come home with mites. Check the water bowl to see if there are any teeny-weeny black dots in it - tell-tail sign of mites - and look him over very carefully, especially around the eyes and under the chin. Hopefully, after a careful exam of the snake and the water, he'll come out mite free.
If he continues to soak, I would place him in a clean empty tub and give him a spray down with this: http://www.reptilebasics.com/mite-killers
This will kill anything that might be on him and you'll see them come off of him and be left behind in the tub. If there aren't any mites on him, it won't hurt him one bit and then at least you'll know for sure he's ok.
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