anyone want to help make this flea bass growl?!

well, if you're not married to the lane poor pickup you could try an MM pickup that allows series/parallel switching - this'll let you go between the standard cleaner sound and a more midrange focused sound.
Or maybe put in a 3 band preamp, so you can boost some low mids?
When I had a flea bass, I put in an aguilar obp-3 preamp - it keps the clarity of the bass but I was able to get some 'oomph' in the sound by boosting low mids.

 

I know the opb-1 was an option for the flea basses. So maybe an opb-3 will fit as well. The bart. pre I have in my flea had the added midrange knob @400. They are also making flea basses with Jazz pups now.
Maybe eq your amp diff.

 

it adjusts the input gain

 

Well, you could drill another hole if you wanted. I just had vol,mid (push/pull freq), stacked bass/treble.

As to the Aguilar Kits, the underlying preamp is exactly the same but the pots included differ depending on kit.
TK has separate mid,bass,treble pots and the SK
has mid pot and stacked bass/treble (although in reality you could choose to wire it bass and stacked mid/treble).

The PP kit has the mid pot with push/pull, otherwise a regular switch is included.

So, to sum up
Assuming you don't want to drill any holes get the OBP-3SK/PP

 

Cool... these kits weren't available a couple years ago when I put an OBP-3 into a Stingray 5 and found there was no pot available that would allow push/pull switching of the midfreq (thread here )

Did the push-pull midfreq pot have a center detent?

 

i dont have the OBP3 in stacked but i believe they have all their tone pots with center detents. at least my OBP3 is

 

yup