First, that seems like alot. 3 sets for incline/decline/flat bench/close grip/pec dec is 18 sets for chest, which is alot, too many. Cut something, anything.
Second, mix up the dumbbells and barbells, perhaps you could do:
flat and CG bench with BB, incline/decline with DB and then
flat DB, incline decline BB
Third, mix up reps/sets ranges, unless you are solely interested in bodybuilding/hypertrophy, you shouldn't do everything in the 3/8-12 range.
Some 5x5, some 3x8 and some heavy 3x3 mixed in would be good.
Fourth, I assume you're doing chest workouts twice a week. If you want to add dips, then I suggest just adding a light bodyweight component to one of your other days. On your legs day add 3 sets of push-ups, and 4 sets of dips. Nothing to prevent your resting, but working with your bodyweight would be good anyway.