I always thought the larger the aperture the more light doing in so more detail but haven't done too many long exposures to find the sweet spot. Maybe if I was down to f/8 or 10 I would have gotten better results.
that is certainly true, that is apart of the balance you have to figure out for long exposures; if you open up your aperture you don't get as long an exposure, which may defeat the purpose, just gotta experiment with the aperture & exposure time to get your desired result(s)...you could also use an ND filter to get those longer exposures while being more at the sweet spot of your lens(es), it really just depends on how serious you want to get about pixel peeping to achieving the most detail