Aegislion

I am testing prints for a larger piece that will have multiple overhangs. Support I used BVOH for better removal, and main used PLA White. Ran into two problems: 1. both test ran into change in line thickness and consistency where there are changes in geometry. Does it have to do with temperature settings? 2. The overhang model are supported with BVOH material for easier removal, but the outer edge always are very poorly printed, it should look something like the "good" image(a test I did with same material) How do I fix these problems? Let me know if you need specific settings for reference. Thanks!