So I have a 5 string mandolin with bartolini pickups (in P bass covers, I believe they actually are bass pickups) and my problem is that they only have 4 poles and the mandolin is 5 strings. the tone is great (obviously bartolinis are high end) but my e string is barely even making noise, and the sound is very un-even. I am thinking of getting a rail style pickup like a bill lawrence, but I havent been able to find any that would fit in the smaller slots. Does anyone have any ideas of existing pickups that would fit? or any ideas on this situation at all. heres a picture of the beast.
Its the one on the bottom (that exact one to be precise)