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I would be a bit more concerned about a single skin wall carrying the wind load, especially as it's a fence not a trellis but as you've already had a fence fitted it must be quite stable/sheltered.
When I fitted them I checked they were upright before/during the cement drying (which is very quick), if you've drilled larger holes than the threaded bar there's 10 degrees play. There's limited force involved in moving them 5 degrees or so to get them spot on once the trellis is going up.
Try it behind the shed and see how you get on.
Airhead
That looks absolutely pin sharp! Very nice. I think your wall looks substantially more solid than mine. I'm worried that if I were to drill down only 120mm, mount the post and then lean on it to try to straighten it, there's a fair chance that I'd just tear the top 2 courses of bricks off. Having said that, there is one place that I can't get to the face of the wall easily as it's behind my shed, so I may try out that approach for that one post.