If you're only going to sidechange the lows, don't create a three channel effect, just two channel, bass in first, other two in second. Even when left at zero, separated EQs like that will color the sound where they crossover, so avoid having unnecessary EQs on your channels.
My standard side chain bass cut in Ableton looks like:
GROUP
+ 0db --- Low EQ | Compressor
+ 0db --- Mid+Hi EQ