I have had similar issue and find using smith machine helps
What i do is set the bar at the bottom of the bench ie chest level and the
Load it up with my max bench weight and press it up from the bottom
And the dock it at the top i then strip the weight off put bar back at bottom and add 2.5 or 5
Then press it up unload bar and again add more weight
I know it sounds weird but it works for me and others ive shown it to