Formula to Figure Out Range?

Also is there an easy way to figure out the difference w/wo buffs? Because I will have a different level of Ignis Lore tomorrow as well to figure out buffed.

You add in the buffs or don't add in the buffs.
Really, this should be simple math.

Ignis Lore gives 40 Atk at max, so you add 40 Atk to your total if you want to include it.
If you're using lower levels, you add in however much it adds at that level.

The problem seems to be that you're not giving the right numbers/leaving things out.