well, I do not have a specific mech. I am always random making mechs for fun attack.
Now, I have one that never deleted for long and use time to time in rare moments. Mechs change according to the seasons changes reason I do not have one in particular or a set of TITAN fights. Never created. For example, this one, picture below, in some seasons can work 3 steps perfect having heat to prevent attack, scope if heat will be too low to paralyze the attack so can kill in one shot or overheat with the crimson and heat bomb or the side weapons. It will be ok for stage 4. Can finish steps 5 but will be not that good and won't be good for step 6.
I can use when get bored a regular heat hugger or sometimes depend on go with phys dual recoil or energy recoils or heat recoils, or jumper snipers and too many weird mechs for entertainment. I use legs or claw depending on my mood.
I have never perfected attacks like some players do to minimize damage and do more perfect attacks.
As much damage your mech gets, the lower score will be. The idea is to reduce damage. I use energy mechs, heat mechs and phys mechs combos. Sometimes I go all the way heat.