Powers don't stack with stunts unless they say they do. For example, the strength powers say they increase the damage (they don't say they give a Weapon rating). A flat +1 from a power basically tells you to not take stunts that don't give at least +2 bonus. At least as it relates to attacks (otherwise things get WAY out of hand). The game does give a lot of bonuses to lifting/breaking inanimate objects though.
Personally, I don't think I would ever play a character that just had 1 refresh of powers. It isn't really worth it (in my opinion) to give up the +2 refresh Pure Mortals get for just a single -1.
Stunts
* Take a stunt to move the Dodging trapping to Weapons.
* Take Wall of Death (spray attack via melee Weapons).
* Take Riposte (successful block turns into an immediate hitting strike).
* Maybe a stunt to allow you to do blocks for another (probably one at a time...) with your Weapons skill.
Skills
* Maybe go low Scholarship (remember Scholarship technically gives extra spoken languages) and higher Lore.
* Take Survival (riding).
* Tell your GM you are replacing Guns with Bows (YS 132). But this is very double-edged as it means you take a -2 when using Guns until you take a stunt to compensate.
There, 4 stunts and and pure mortal. Even in a Feet Wet game, you have 4 fate points, which is pretty awesome. Riposte is a pretty broken stunt.
Here is additional stunt you might consider:
Sheathing The Sword: Sometimes a warrior knows that victory is more valuable than the life of any one swordsman. You may spend a fate point to use this stunt in doing so you get a +2 on your Weapons, but the target of your attack may immediately sacrifice its next exchange action to immediately counterattack. This counterattack occurs at the same time as your strike. You may not Sheath the Sword more than once per scene.