A big tank for a small snake can be an issue because sometimes it's harder for babies to find the hotspot and also they may feel less secure which can create stress. You can look on your local craigslist for a 10 or 20 gallon tank, which would be perfect for a baby ball. They usually run about 10-50 bucks, heck some people even give them away. If you buy a new one at a pet store they're about 30-50 for a 10 gal and around 70-100 for a 20 gal. If you don't get another tank you can still make it work, just make sure you add extra hides to help your snake feel secure.

Your set up isn't bad, good idea with the multiple water bowls, and keeping one on the hot spot. Just make sure you fill them up daily. I've noticed that shallow bowls tend to go dry quicker. Other than that I'd say aspen isn't the best at holding humidity, especially combined with a tank. A good way to keep humidity in is to dampen some paper towels with warm water and lay them over 3/4 of the tank screen. That's what I do and it works well, but you will have to wet them 1-2 times daily. The next time you buy bedding go for something that holds humidity better like ZooMed Forest Floor, but as long as you can keep your humidity around 55-70% you should be fine.

Oh, and be sure your heat pad is regulated by a thermostat. Without proper temperatures (between 88-91 degrees) your snake may become sick and have trouble digesting. Too hot of temps may also burn him, which can happen when your heat pad isn't regulated. You can buy a thermostat on reptilebasics.com or buy one on Amazon, I use a Hydrofarm Jumpstart Thermostat. They are $30 on Amazon.

It can be a bit stressful getting your set up correct, and everyone goes through it. Just get temps, humidity, and hides under control and you will be fine