Wear on side of front strut

Hello,
I had some work done last year (tires, replaced worn CV boots, alignment). Ever since then my truck has seemed... bouncy or wiggly.. Just a small subtle instability in the front end.. Like every bump resonates a little. I've been blaming the tires.. (different brand than I had before).

However, I noticed this.. The side of my shock/strut is worn... I have not noticed any wear here in the past, and probably would have.. Not positive, though.
Anyway.. What do people think about this (see attached pic)? And how to fix? Just tighten the top middle strut bolt? The strut doesn't seem to be completely centered in the tower either.. And, both sides are the same. (both not quite centered, and both wearing in that area).

Thanks!