Yeah... remember when SJ doubled the APB's damage but gave it quarter to shields in the PBW Version of P&N? I quickly realized that you could design a mega uber ship with just shield depleters and APB's - the shield depleters do around 4 HP/kT/round to shields while the modified APB's do something close to that to internal systems and armor!
SJ promptly fixed this by increasing the rads cost of APB's to insanely high levels - something like 1200 rads for just one top-level APB!