Glad to hear you got it fixed!!!
I have a Vaquero in .45 Colt,, that when I'd shoot it,, I'd get "left & low" groups. Before I went to "tinkering" on it,, I had a very good handgun shooter,, (sixshot) test fire it. He too got the same "left & low" with a very nice tight group. I thought I'd have to wrestle him to keep my gun. He still wants it.
But,, after confirming the need for a bit of corrective surgery,, I chose a different route. Knowing front sights can POSSIBLY pop off from too much force or attempts at bending,, I decided to work on the rear sight channel.
We mounted the gun in a mill, and using a tiny end mill cutter,, we carefully opened the rear sight channel a little,, causing the alignment to shift. So little was removed,, it can't be seen. Plus,, my gun is stainless.
Someone with steady hands & a bit of patience,, and skill, could use a file to get the same results.
The elevation issue was resolved with a different load.