Stats:
Age:25 Weight:165lbs BF:7/8%(Just finished cutting) Height: 5"8 Training time: 4 Years

Just looking for some advice on this cycle and training/nutrition. I have been reseaching for the past year and I am not looking to start it until the end of the year so got a little bit more time to iron out any kinks.
Nutrition: IIFYM/flexible dieting, 4000kcal 500c/300p/90f. I currently bulk at 3500kcal (very active job), would the extra 500 per day be beneficial?
Training: Ive been running this routine just over a year now, saw good gains in strength and kept most of the strength after a 12 week cut. Dont want to get into a discussion about my routine just want to know if its got an optimum amount of volume and frequency. Usually do the routine push1/pull1/rest/legs1/rest/push2/pull2/rest/legs2/rest/repeat but I will be changing it to push1/pull1/legs1/rest/push2/pull2/legs2/rest/repeat. I have the option to change it to P1/P1/L1/P2/P2/L2/R, if its better that it falls in line with a week.

Push1: 10 sets chest (bench, incline bench, flyes), 8 sets shoulders (Military press and lateral raises), 6 sets triceps
Pull1: 10 sets back (BB row, pullups, cable row), 2 sets rear delts, 2 sets traps, 6 sets biceps
Legs1: 12 sets legs (Squats, Leg Press, Leg Extension, Leg Curl) 10 sets Calves, 8 Sets Abs
Push2: 10 sets chest (incline bench, chest dips, cable flyes) 8 sets shoulders (Seated DB press and cable lateral raises) 6 sets triceps
Pull2: 4 sets deadlifts, 10 Sets Back (Lat pulldown, DB Row, cable row) 2 sets rear delts, 2 sets traps, 6 sets biceps.
Legs2: 12 sets legs (hack squat, lunges, leg extensions, leg curl) 10 sets calves, 8 sets abs