aside from that, is there a soft transition between the base and the next segment in the high? if not, you could bake them in seperate passes. I think what you see is the rays hitting the surface of the base
Other than straightening/making MUCH more use out of your UV space, that gap that you've circled is simply due to your low-res mesh being a bit further out/larger than your high res mesh. Give your low-res mesh another look at how far it's faces/edges are from the high-res mesh underneath
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aside from that, is there a soft transition between the base and the next segment in the high? if not, you could bake them in seperate passes. I think what you see is the rays hitting the surface of the base
But
That's pretty much what I'd expect - does it look OK at a sensible viewing distance?
If so it's fine