Here`s a stab at generalizing:
1) For swirls/etc. use "point-source" illumination like your MiniMatch or some other single-LED light. OR the old fashioned incandescents if you still have any. Amazing what a ceiling-mounted 60W bulb can reveal in an otherwise dark room!
2) While it can be challenging to do, inspecting in an otherwise dark room is simply great. SO MUCH BETTER than letting stray light factor in. But gee, IRL that`s just not always possible.
3) For textures/orangepeel, you might find a fluorescent light works well. Heh heh, that`s about *all* I find those good for in this context as they sure don`t show swirls unless they`re really awful.
4) You hit on a good point with the "how to angle it..". Between how you position the light, and how you do the viewing, those factors can be critical. More of that "easy to say.." stuff there

but that`s just how it goes.
While I`ve yet to try one of those, I bet that anything it doesn`t show in an otherwise dark room will be so minor that it won`t show IRL. (Yeah, I know..this is Autopia, but "looks great in real life conditions" is a pretty good standard IMO, if only so you don`t buff off too much clear in search of perfection.)
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