great comments so far guys, the wpolys are very reasonable throughout most of the map now, but there are still a few areas i need some advice on. here is a pic of how i adjusted the map. in the upper right corner is where i get the most trouble. the 2 yellow spots around it is where i put some temporary walls to see if it would fix the problem.
here is an in-game picture of the corner that i have secluded. note that the walls to not connect to the sky, but they are pretty tall.
as you can see, the walls did nothing to shelter vis from drawing the rest of the map. any ideas why?