My 2 euro-cents:
99% of what they write to sell you pickups is BS!
You paid far too much for the pickups you bought last time.
The sound you wanted could have been achieved at a small fraction of the cost, with the pickups you already had.
EOR,
Basil
Hi :)
Cut or unsolder the wire at the blue cross and connect a 47KΩ trimpot as sketched.
That'll give you up to 12dB drop in volume. The Tone capacitor might need to be replaced with one ½ to ¼ the original size, depending on your liking.
Have fun;
Basil