make sure
that you have the same amount of shaft on either side, other wise I’ve never heard of feather angle causing misbalance in your stroke.
I use 65 with my Ikelos (euro)
45ish with my epic mid wing.
None
When I was young and strong I found feathered paddles hurt my wrists (probable was using bad technique- have always had poor flexibility).
Have used unfeathered double blade paddles in both canoes and kayaks for almost 4 decades. In the last five years I’ve moved to Aleutian and Greenland style wood paddles and my now old wrists feel fine after all day paddling.
Dave