L1, L2, L3, L1 works best for me in ROL with synergy team. If you did something like spam heavies I guess L1->L1 repeat would be best. The armor breaks on L3 are more effective because they get applied after animation is over and you can set up instantly attacking with parry stun. The damage is also really good from L3. I think the enemy needs to have over 300k-350k health for the L3 rotation and you need to be able to be very agressive. Otherwise I bet L1 and a splash of L2 would be more practical.Landing a standup intercept after special can help damage a lot.