Try with 3 PCIE cables to see if that solves the problem.
If you must go with only two then switch the plugs around so the daisy chain ones plus into different slots. I don’t think power draw is spread equally on all three. Assuming your PSU is high quality and should be able to handle the load.
OP already uses two separate PCIE cables. The GPU has however accepts three plugs so one cable is daisy chained.