I've not released a higher res version or a base map (I assume you mean just the blue starfield background) and probably never will; I've been wanting to make an improved map for years but you know how it is.
Thank you for your kind words, and my apologies for the late reply! I've been working on this science fiction setting for a very long time, and still am (though it's slowed down a lot). This map is no longer current, but it's a lot nicer than the current maps. There is a detailed "future history" behind the setting, so while not every system's position is exactly planned, the entirety is very deliberately set up. I do not have maps of individual worlds, but I do have notes of varying length on a couple hundred of them. I sometimes tell myself that I will, some day, finish work on the setting and write a novel or something, but I probably should admit that I'm never going to do that.