Congrats on owning such a great light! (for the $$$).You'll be fine with the lithium primary. Of course you could consider "the Fenix L0D conversion" where you use the clicky switch of the Microstream with the high power LED of the Fenix. Then you could really ramp things up with a 10440 cell.
Even right out of the box, the Microstream is an excellent light.
It will appreciate the opportunity to savor that lithium primary.
If you need cold weather performance and storage, the lithium primary could be the best overall choice, not the cheapest.