Slabs - am I alone being much worse on these problems?

I have been climbing for over 10+ years. I'm not great but ok for my age, max out at 7c (V9). However when I climb slab I hardly ever go higher than 6c (V5).

My climbing buddies gave a similar "handicap" as me but we climb together so maybe we are all making the same mistakes.

My question is if everybody is worse at slabs or am I just uneven?