Speculation/Possible B.S. on Pec Minor
The pec minor helps stabilize/support your shoulders/scapula.
Wide Grip Bench makes it more difficult to use or engage your back.
Pausing at the bottom (Spoto Style) really challenges your shoulder stability and position.
Maybe you got a little out of position at the bottom, your back/arch/set up wasn't exactly right, and your pec minor was strained/cramped fighting to keep you in place.
Regarding close grip bench.
Greg Nuckols looks to keep the bar "high" the elobows "out" and finish with the bar above the shoulder.
If you are going to bench closer, with the elbows tucked, the bar will touch lower on the chest. To keep the elbows in and use the tris, you drive straight up, keeping the bar "low" and push yourself away. Or kinda "push the bar towards your feet."