I've got a Washburn Force 4 ABT in natural bubinga....neck thru....SWEET bass !
I was about to grab some new pickups for it thinking they were the issue until someone on the Washburn Forum pointed out that they are made for Washburn by Bartolini................
So I kept the pickups & opted for an upgraded Glockenklang 2-band EQ.
Maybe check the Washburn Forum for an answer
Good looking 6-er BTW