Replace first mech's legs with massive lava feet, until you get them you could also upgrade massive stone feet, they'll be helpful sooner or later.
The first mech's weapons are just all over the place, choose:
-heat hammer+laser cannon/heronmark+flaminator+savagery+heat bomb with nemo drone;
-magma recoiler+supreme cannon+desolation+laser cannon with backstabbing protector.
Upgrade first mech's drone.
Upgrade first mech's modules.
In general you want more resistance, equip savior's resistance.
Second mech doesn't need hysteria, double malice is better, therefore also replace last words with lightning recoiler. Lacking range 1 coverage on any mech is pretty bad at mid ranks.
That's about it. There is a lot of work ahead of you, but see it as a goal, one of many. You have lots of potential. Good luck!