Keith,
Your pain is a warning. I would rest and stretch for at least 4 days without doing any chest work or anything that may end you up in a doctor office. I cannot comment on your form, but since you were lifting from the rack, perhaps having a spotter is a good choice for awhile.
I can comment on your schedule. You are doing, correct me if I am wrong, a total body workout every other 1-2 days. How about trying to split it up? I personally have seen the best results in bodybuilders (I have never been that focused on bodybuilding myself, but I am a former personal trainer who spent 20+ years of her life working in gyms & health clubs) is training one body part no more than once a week. Just do chest on one day. Do push ups, flyes, incline, flat & decline chest press, cable crossovers. Just beat the crap outta the pecs (tris and frontal deltoids will get hit a decent amount too). Next day, do abs. Then back. Then shoulders. Then bis & tris. Then legs (compound movements mainly). Then rest.
If you don't like that, then do chest, tris and abs one day. Rest. Back, bis, forearms and delts. Rest. Legs. Repeat.
Anyway, best wishes on an injury-free workout.