Personally I prefer to use evade with the damage upgrade instead of poison mist, since I just don't like how it looks, but other than that my solo artificer build is pretty similar to yours. I was using a DW build with flank attack for insta stealth, and spinning blades for my other DPS ability, but ever since leaping shot got an insta stealth upgrade of its own with Trespasser, I find that it I greatly prefer it to a DW artificer.
That said, it's worth noting that a DW artificer will still ultimately out damage an archer build thanks to spinning blades and greater flanking damage, buuuut the archer is probably better for soloing with (especially with trials on) since it doesn't need to hug enemies to fight, which is a huge advantage once you get to JoH or that obnoxiously difficult multi stage battle in The Descent. lol (Oh, and fire/ice/shock mines from mages can be a gigantic pain for a DW artificer in the base game, so there's that too.
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