I have a passive P/J with DiMarzio Model P and Model J. The controls are V/V/T with a 3 way pickup switch. The volume pots are 500K each. The tone pot is 250K. What is notice is that when I have the 3-way set in the middle, i.e. both pickups on, the volume controls don't seem to blend very well. Instead, if I have one pickup full-on the other one off, and then slowly increase the volume of the other pickup, nothing happens until about the last 1/4" of travel. Then the other pickup comes on full. The remaining 10% does not does not increase volume at all. I hear this is common in passive p/j circuits. Any suggestions on how I can get a smoother blending?