Side note: There's some diminishing returns with having a high frequency on potions. The combat advantage of a potion is not having to declare it beforehand and using the FP or lore roll (which you're likely to make, given that you need high lore anyways for crafting) to declare the potion on the spot.
That said, once the potion is declared, you're stuck with it for that session. So suddenly having 5 uses of "truth serum" (raises your empathy levels to new heights so you can tell when people lie) with you for that session may not be advantageous, as you're probably only going to need it the one time.
So an alchemist relying mainly on potions may be better off buying the refinement for extra slots, vs extra uses.
However, if you did have 5 uses, potions can be used by other people, so now one slot could potentially cover everyone in the group.
If you've got other enchanted items, and then a couple of potion slots, then the frequency boost for your items is great, and when you declare the potion just try to think of something that could be handy multiple times, or for more than one character.