Try a breed neck, a reverse wound blue velvet and a
breed bridge along with a super switch wired like a jem. Positions two and four will slpit the humbuckers while the reverse wound middle pickup(real single coil) will cut the noise. The reason your quack sounds are weak is that the output of the evos is drowning out the middle pickup. You could just install a Di Marzio fast track I in the middle along with changing the value of your controlls to 500k or 1 meg-this would be way cheaper than getting new pickups and would give you way more high end and allow the volume of your middle pickup to balance with the evos.
The really good quack sounds are usually created by weaker more vintage output pickups or having your pickups further away from the strings creating a weaker more balanced sound. All the well set up strats I've played have the bass side of the pickups way down and the treble side raised. I tried this on a G & L I had with two fast tracks and a
tone zone s and it sounded pretty convincing. Good Luck.