No wonder you're not making gains. You're doing chest and back on Monday. When doing chest, you're using a lot of triceps and when you do back you use a lot of bi's. Then the very next day you're using your tri's and bi's again when they got beat up the day before. And then the next day you're doing shoulders, and when doing pressing movements, you're involving your tri's so thats hitting tri's in some way shape or form 3 days in a row.