How's the Rickenbacker tone with flatwounds vs., say, a Precision bass? Does the unique Rickenbacker tone come through, or do the flat wound strings subdue it?
On my white 4000, I’ve used Pyramid,Chromes,and Optima RBs. (Actually, original ‘70s Rick/Maxima 4440 set).
It sounds really great with any of those, still sounds exactly as a Rick bass should.
(Minus the rw grind, just replaced with a nice treble bark).
I think the best sound of those 3 was the Chromes, because they had a brighter edge.
But even with their lightest, softest gauge, I didn’t like the stiff feel of them.
I’ve used Chromes on a fender 57 P avri and a GL LB100, great sounding strings on both.
For the P/Rick comparo, I found the Rick with flats still had that unique audio presence that cut through,
where the pbasses blended in more. (Which is why I no longer have them.)

I had a set of the Labella LTF on another neckthrough 4000 that had an HB pickup,
and they sounded huge, but still very distinct, on that bass.
I had an old set of the Maximas on my black Laredo, but I never thought they brought out the best
in that bass. I sold it recently, and gave the buyer a set of Kalium hybrid rw strings….looking forward to checking it out when he puts those on.