I have tried an assortment of different flats, and have landed on the Chromes as my main strings of choice. I have 5 basses, and 2 of them strung with chromes. The short scale uses LaBellas, I have one bass with rounds, and on my fretless I still have the first set of flats I tried. It will probably get Chromes, too.
I am kind of a balanced tension geek, so my Chromes sets consists of single strings in the gauges 045 060 080 105. This is the closest approximation to balanced set I have found with Chromes. These gauges works great with my tuning, which is DGCF.