Each workout has 6 exercises, 15-21 working sets a pop. If you're flying through the workout in 45 minutes and you're that froggy after each session, the truth of the matter is that you probably didn't lift heavy enough. Post them numbers up.
Other than that, I don't know what to tell you. Exercise professionals will give folks a proven plan for success with detailed analyses and testimonials for free and folks will still wanna change it and fukk with it for some reason.

U natty, right?
How doest this sound: a natty breh wants to bike back in forth to work, play full pitch soccer like he's in the MLS, lift weights 6 times a week for a couple hours a pop, preserve muscle, correct strength asymmetries, and increase his strength all on a 500+ calorie deficit, not including the calories lost from activity.
A lot of the questions you're asking are addressed here:
https://jcdfitness.com/wp-content/download/Lyle_McDonald_Generic_Bulking_Routine_FAQ.pdf
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I have no idea what you mean my "activate more of" your left arm during bench press. Almost everyone has a natural strength asymmetry associated with doing tasks, whether that's gripping, squatting, standing, etc.
Unless your left arm is so weak it's hindering you from benching properly, I wouldn't worry about it (especially right now) but I know that's probably not what you want to hear. If you do try to address it now you can add that to the list of things you're asking your body to do concurrently.
@Gully Bull You transferring your old I.R. spot to dude?