Your pic isn't showing up, but I pulled the URL and went to look...
The Q-filter is very reactive to everything in the circuit (it basically changes the inductive peak of the pickups), so keeping the normal tone control will affect it - a lot of guys fit a switch to switch between the normal tone and the Q filter.
This is the usual wiring for it, note that it should also have an external cap and resistor (that it comes with):
Or with the switch: