You must not of gotten the right kind. Companies add their own additives for smell purposes to make it their OWN.
The stuff most use is Horse bedding which has pine smell. And the rats will learn to lay on it as it breaks down to a saw dust type.
And no one said the smell of the bedding was minimal, it kills the rodents smell very well, not to mention is mold,bacteria, and insect repellent.
Also its Cheaper than aspen or pine shavings as my 40lbs bags cost 4.59 per bag and lasts me 3 cleanings per bag for 500+ rodents.
On a side not way to contradict your self. You say DONT use pine but yet you used it. Using pine for your rodents HAS NOT ONE ill effect to the snakes. I and many many who breed thier own rodents use pine pellets or shavings for YEARS with no problems.I tried those pellets a little while back and had the exact same problem. Not only was it costly to purchase the pellets, it was also stinky and the rats/mice HATED it. I have stuck to aspen from then on. It might be a little dusty, but it is much better at odor control, the rats can manipulate it and make it comfortable for them and it's not that much more expensive than pine.
Whatever you do, DON'T put your rodents on pine or cedar. Both of those have Phenols that cause respiratory problems in small animals that could possibly lead to death in severe cases. So there you have it....my two cents worth.