Sterling SB14 but a 5 string

So I have a Sterling SB14 and I just love how it sounds and feels. I am in a cover band and need a 5 string for most of the gig I also have a Sterling Ray 35, but the sound just isn't there. A little to crisp and high end. I've messed with the EQ for years, and there's just something missing. Is it the preamp? Is it the ceramic vs alnico pickups?

I can not got a Musicman Sterling 5 in my hands, and can't justify spending over $1,300 with out touching the bass.

Any advice or suggestions would be appreciated.