By training shoulders and triceps twice a week, and trying to add weight to those exercises, while trying to go up 5 pounds in the bench every week - is probably going to add up to overtraining. The triceps need recovery time in order to get stronger, the same goes with the delts and pecs. If you are trying to put on 5 pounds on your bench per week - concentrate on the bench one day per week and heavy triceps about 72 hours after benching. If you start to try to PR in all your pushing exercises - you'll might wind up discouraged, as well as overtrained.
Spatts is right, you can't regulate your gains that precisely - "5 pounds per week" - the gains come on the days you feel good - which might not be every training day - but I rarely just go up 5 pounds - usually on a good day - I'll have an increase of about 20 pounds - but I might not increase again for another 2-3 weeks.
BE PATIENT.