I'd say if it ain't broke, don't fix it!

The Barkers (Dave & Tracy Barker of VPI) keep all their ball pythons at a constant, single temp and don't offer a gradient or basking spot, except in rare circumstances. This has worked quite well for them.

I see this as a prime example of how there is more than one way to do things right. Personally, I prefer to offer a gradient...and I think that a snake raised with a gradient would need to be slowly acclimatized to a single temp environment to decrease the chances of it getting sick. But your ball python is already used to just such an environment...so I think that's fine.

EDIT: OH! And welcome to BP.net!!