First, apologies if this is a question that isn't easily answered. I've been trying to figure it out. Also, I know I was suppose to get video of my lift but I haven't had time yet.

I had a trainer look at my lift. I was apparently lifting with my shoulders raised (Not off the bench but up towards my head.) and I wasn't lifting straight up and down, I was lifting diagonally to a degree. I've been practicing with better form and lighter loads.

Yesterday, I was back to my regular weight. I lifted and 'felt' like my chest could lift for the last rep, but something was keeping me from getting it all the way to the top of the ROM. I'm not sure if that's just the way it is or if I have a weak link, a muscle, that needs more attention.

Is there a means to finding the weak link? Or is this just something that you eventually break through with more benching?