A few years back I had a Markbass 212, can`t remember the model number but it was a very good sounding cab, and as expected, nice and light/portable. Worth checking out if one comes up.
Back in the day I`d often go on stage having had at least 6 or 7 pints. In fairness to myself I was a very big drinker at that point so although my playing wouldn`t have been spot on it wouldn`t have been atrocious either. The problem was that we were all like this, so although we weren`t bad individually, collectively we were dreadful when we were all on it.
I found that on guitar, I prefer to get the sound/gain from lower wound pickups cranked more, rather than higher wound cranked less. Gibson SG for example, I prefer the 490T pickups to the 498T, just sounds better to me.
Right, so assuming those pickups follow the same route as the Precision then they’re scooping mids, so it’s these you’re needing to add in. In your position I’d look at the Fender Pure Vintage 74 Jazz pickups, I had a set in a Squier 77 Jazz and they really improved it.
What year is the Jazz? The series it`s part of can make a fair bit of difference. If the Jazzes follow Precisions in similarity:
2008-12 - very scooped
2013 - 16 - warm, rich bottom end, a tad scooped, and sound very much like Toneriders