Lower the weight or substitute with dumbbells or as you have planned stick to what works. It’s odd that you can get 10-11 and it’s all shoulders, you have the strength to press 315, but go to 135 and do perfect reps where your chest is the one getting the load. Not sure how you bench, but drive shoulders back and down, retract scapula and create a bit of an arch then bench. Even if it’s light at 135 do it slow and controlled. Once it’s down 10 reps and you feel it in the chest go to 185 do the same. Then 225 for as many as you can get where you feel it in your chest. If no interest in going through all this simply keep banging the dips, why change what ain’t broken.