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Do you work at a desk for long periods?
The physio I had basically said when you’re working out do some chest stretches. Arms up elbows at 90 degrees and press you forearms against something to stretch. He also said and I thought this was a joke but rub your chest, flex your muscles. Just to make sure they are activated. Do a light set to yet again make sure you can feel your chest firing and then work from there.
I do this every Monday and probably look a bit of a twat in the gym, but it works. I’m probably a 40B/C
The reason I ask if you can feel your pecs is that you might be lifting with your arms and not your chest.
I had physio a few years ago and he said that my pec muscles didn’t fire at all. So they were essentially “off”.