Dual CL doesn’t work unlesss your opponent has really low cooling. You need to damage as well. No substitute for Supreme Cannon on a heat build.
The above took me to R2/3 with no myth HP/Resist.
However, make sure your mods are mythed and maxed, and you need at least 1800-2000HP.
I tried dual CL. It’s utter FAIL when going beyond R5.