I appreciate that you only have the bench at home which is why I mentioned not having a spot. Drops sets is a way of getting round this as you can really pump the muscle up on your own or nicole could help with them? Maybe do your pressing at home then go to the gym to finish it off with flys & pec dec etc?
I think you have never had a sore chest as you appear to be burning the muscle out with lactic acid with the stretching movements as apposed to breaking the fibres down and pumping it up.
May sound funny but after a shit hot chest work out, when running your tits bounce, like a birds do I guess as they go that weak and uncontrolled!