I would add either leg press, squats or trap bar deadlift to block 1, possibly at the end of the block. I like to have a hip hinge movement, without that I think there is a substantial amount of muscle not being worked.
For your next session (Workout B), put those Block 4 exercises in place of the Chest Press and Seated Row. And perform in this order: NO Chin, Biceps Curls, NO Dip, Tri Ext
For Workout A, do Block 2 last, so it does not limit Block 3 performance. For Workout B, it’s fine just where it is!
(Option) For Block 1 in Workout B, perform only Leg Press (30-10-30)
I like to vary cadences and order. I like Double Holds on Leg Curl as they help me to reduce my tendency to lift my hips, meaning I get a better contraction at the top of the movement.
The question to all remains: What would you change and why? (just for clarity - this is what would you do, not what do you think I should do).