if you want to draw all outlines in a single line, having those lines is unavoidable. they might not have to be that extreme, but if you look at two ajacent tiles, the outline for each is seperate, making it impossible to draw muultiple ones with a single line.
alternatively you could make the outline just a different tile you swap out, or probably better an overlay on a second tilemaplayer.
#Outerlines everywhere on hexagonal grid
ebon eagle
faint mason