You can easily test the "maximum brightness" of your pickups by connecting it directly to the plug with no pots for a test, or some crocodile clips to the cable. You won't be impressed.
The "1Mohm vol pot is more like a switch" statement isn't correct either. But you won't hear a difference in general brightness between 0.5 and 1 Mohm with a bass, much less with these pickups.
The "1Mohm vol pot is more like a switch" statement isn't correct either. But you won't hear a difference in general brightness between 0.5 and 1 Mohm with a bass, much less with these pickups.