Help with my sand boa (serial shedding)

My adult male KSB has only eaten twice this entire year, but this is his FOURTH time going into shed! He last shed May 10th, so I was horrified to find him in blue again. I don't see any mites on him, but he has a few discolored belly scales, and at this point his tail looks painfully chapped. (Note that he had no stuck shed that I could see, so this is especially worrisome to me.) The very tip of his tail is red.
He's in a 16 quart tub with a 90F hot end and aspen bedding. I've used the same aspen bedding for years (bought it in bulk), but maybe I should try switching him to Care Fresh in case the aspen is the culprit?
Any ideas appreciated. I love this little guy. :(

EDIT! After a ten minute soak in luke warm water, I noticed that the driest looking scales have a brown mark in the middle. Does this indicate anything? http://i.imgur.com/yIXR1XG.png

I wonder if he got burned earlier this year and I somehow didn't notice, but would that account for a very dry tail?

Sorry for the double post but I just want people to see the update. My sand boa was in a plastic tub with a (small) water bowl 24/7. Someone on another site told me that this might be making his humidity too high, and the high humidity is causing the issue. I'd like to keep him in a plastic tub if possible. Is it okay to offer him water a couple times a week...?

Ideally I would cut a big window off the plastic lid and replace it with wire mesh, but I have no idea how to do that. Any advice from handier people would be appreciated.

good amount of hot glue around the edge

Measure the size you want the hole to be and mark it with a sharpie, cut the hole with a hunting/carving knife or heavy duty scissors, burn the edges so it's not sharp, use a staple gun to keep the mesh in place, wood glue or duct tape (on the outside could work as well. Done.

Thanks, guys. I'll give that a shot.

Instead of adding one large hole you could burn several smaller holes through the tub with a soldering iron.

Also put the holes up high on the hot side of the tub, and low on the cool side of the tub. As the heat rises in the hot side it flows out the holes, which pulls cool air in through the low holes on the other side of the tub, for cross-ventilation.

When I was asking a reptile shop about these snakes, she said you do NOT offer water every day. She said 3 days a week you give them a small bowl. That's it. Weird...

1.2 Normal
1.1 Red-tail
0.1 Albino corn

Quote:

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Originally Posted by SCWood

When I was asking a reptile shop about these snakes, she said you do NOT offer water every day. She said 3 days a week you give them a small bowl. That's it. Weird...

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That seems odd to me

http://www.lllreptile.com/info/libra...nyan-sand-boa/

1.2 Normal
1.1 Red-tail
0.1 Albino corn

I am not a LLL fan. I have heard some things and read some on Fauna Classifieds that paint them in a poor light. I did do some other research, and found that they should have access to water, the main concern is that in a rack or tub it can be made too humid for them, so some suggest giving them a drink often, but not leaving it in. Guess this would be a snake for a screen top fish tank.