I've got D'Addario nickels (at the present) on one with the same bridge- they sound great on the mag pickups, the piezo, or blended.
I tried LaBella White (Copper) tapes out of curiosity (from another thread) and they don't work very well on this type piezo bridge (tho I really like them on a maple/maple 6 string, active mag pickups), as others have also found out: I think the saddles/piezos are not as sensitive as the piezo saddles on A/E basses, and the nylon wrapping damps them a little too much- just my opinion. When I pressed just a little harder on the saddles, or tuned up a bit (creating more pressure on the saddle) they worked better.
I'll try diff strings as I go along, but that's all I can help with at this point.