I am not CT, but I had been suffering from partial pec tear, pull/strain last year so I learned a lot from my experience. If you want to go HEAVY for horizontal press movement, floor press with close grip (with or without bands) is the way to go IMO. In fact, it was my staple last year. You can not stretch the pec so the chance of the injury would be reduced but still get great pec mean/peak pec activation which was cleared by Bret contreras experiment. If you want to avoid the kind of injury, I think you should be carefull with these exercises.
Speed benching
Benching with constant tension
Plyo push up, Ballistic benching etc… (explosive movement)
Benching with bands
Board press (especially, board press against bands is HORRIBLE! even close grip)
All kinds of wide grip benching and OH pressing (but if you go light enough, say 12RM or lower weight, I think it is OK… light weight sucks for strength/size though)
Incline barbell bench press (unless you always go close grip)
All kinds of DB fly (unless you go light enough and limit ROM)
Heavy DB benching (when you set up)
Heavy dips
and close grip is exactly safer but it is not a guarantee. In fact I pulled pec when I close-grip benching. Elbows in stlye and lowering the bar to belly (lower chest) like power lifter is the best for safety purpose. I believe elbows out style + close grip + lowering the bar to chest (+ grinding out reps) = GREATER CHANCE OF PEC INJURY.
In addition, if you are doing much volume of other pressing exercise or SQUAT, (yes SQUAT!) you should cut/check your horizontal press movement exercise volume. Because if you squat heavy, hard, deep (ATG) enough, your pec and triceps would be activated enough. Many people don’t know how heavy squatting is great for upper body pushing muscle. Right now, I am squatting 5-6 times a week like olympic lifter and almost no heavy barbell benching and only doing little assistance work but my pec and triceps still bigger than from bodybuilding isolation kind of work with massive effort/time. I have found that this whole body routine is good for someone who look for “no heavy benching but bigger chest”
a) Back squat
(work up to daily max, then,) LOTS of sets of 2-3reps with 80-85%of the max (max force, autoregulation etc… )
b,c) Other work whatever you like
d) 1 Pec exercise from below list repetitive work a few sets of 10-15reps it is just kinda blood flow purpose
Push up (with bodyweight only or with bands)
Dips with bodyweight
DB benching (incline, flat, decline)
Cable fly and any variation
Guillotine press with very light weight
e-) Other work whatever you like for little muscle
Increasing squat volume/frequency/intensity + little repetitive work for chest after other work (2-3times a week) is the best JMO.
CT will give you better advise but I just wanted to share my bitter experience lol…