No fuck that, do what you want to do. Don't let idiots like me influence your decisions.
At the very least I would keep the full body 3x/week, but do 4 working sets per muscle-group per workout - split between 2 movements.
Ex. CHEST
*warm-up set*
Monday:
Incline bb press (*15-20*, 12-15, 8-10)
Decline bb press(*15-20*, 12-15, 8-10)
Wednesday:
Flatbench db press(*15-20*, 12-15, 8-10)
Incline db flyes (*15-20*, 12-15, 8-10)
Friday:
Landmine press (*15-20*, 12-15, 8-10)
incline cable flyes (*15-20*, 12-15, 8-10)
This way your lightweight warm-up set actually doubles as a working set withing the 3-set pyramid..more volume, but without the CNS overload that you would get from adding additional heavy sets.