I'd probably stay fighter for the faster proficiency gains in your chosen weapon group. Especially since you're dual-wielding within a single group (rather than different groups for weapon damage type variety). The APGs Dual-Weapon Warrior can fit well -- you want Double Slice anyways, so getting it from the archetype is a freebie (if maybe delayed one level). Both Flensing Slice, and Dual Weapon Blitz look fun to me and are within the level range you're talking about.
Howeever Flensing *might* work better with a flurry ranger, would need to compare the fighter's faster proficiency to the rangers lower flurry bonus to figure out which one is likely to hit with both weapons.
Picks in general though (any Fatal) weapon really likes the fighter's proficiency.
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One of my PFS characters is a dual-pick fighter (I think of him as my Minecraft character). He's only level 4, but comparing him to my dual-wield ranger, he is hardier, hits harder, and has more versatile combat abilities. By going Gnome, I was also able to take a Shield cantrip. I was also expecting to be able to get to Weapon Specialisation much quicker and easier with Fighter.
You may want to also consider a backup weapon (likely a hammer of some kind) to have a variety of damage types, that I think might still fit your mining theme. I don't think that would change your build at all