I think the most prevalent thing is me trying to muscle the ball. Since my pro opens are so light, they don't have the plow through power required to just perform the stroke effortlessly. I feel like i have to muscle the ball, it seems.
I stretched beforehand so I really don't think that's why. I also didn't hit any serves. Pretty much only ground strokes.
Current strings are psgd @54
Thanks all for the responses thus far!