1. I alter the program in the offseason to include work to help weaknesses. This is when I will bust out the SSB, bands, chains , maybe pull conventional instead of sumo, and have some fun. You could just cylcle back through with new maxes and mess around with volume.
2. If it is working why change it?
3. Many may disagree with me here, but I am not convinced that just because you do tricep extensions it will help bench lockout. My tricep work consists of board presses, floor press, and close grip bench. Mimics the movement. If it hurts do not do it
Numbers were mussed up, but the 155kg training max is fine. Westside guys used to use 90% of 1RM for their training max