In addition to what mr popular has outlined, I would say that your love for the 3x8 set/rep system might not do you good. Different muscles and exercises are better suited to different rep ranges. This setup also does not permit you to lift as heavy as you otherwise could.
I would suggest that you focus on getting stronger. If you consistently strive to lift heavier and heavier(don’t go overboard and hurt yourself!), you will get bigger.
The main thrust of my post is that 3x8 has not been very productive in my experience. At least not for most exercises.