I’ll chime in in regards to contrast stitching. I’m generally not a fan of it tbh. It works for some styles but not on others imo. I went with it for my trucker since I wanted to connect it to the denim version which does have contrast stitching. I think it turned out great. Fivestar has solid stitch work and I wouldn’t be worried that a contrast thread would highlight errors. On my jacket there are no big mistakes with the stitching. There are a couple of small ones, but they are not that visible.
detail shots
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Your jacket made me decide to go for contrast stitching on my project, it's still in the pattern development phase but I'm curious how it will look when it's all finished