Biggest issues that plague the current balance are:
- Weapon Tunings give Damage, Cycle, Crit for no relevant drawback whatsoever - there's no reason not to use them.
- Robot bonuses are less important then Tunings and number of slots.
- ECM tuning still gives 35% strength for no relevant drawback.
- Ictus Robot Bonuses & Slot Numbers make it impossible to perform it's role of Energy Warfare.
- Armor plates give a large demob resistance which isn't compensated with a drawback (like weight increase) - there's no reason not to slap armor plates on.
TL;DR
Seth has the most head slots, seth is the most used robot because tunings trump everything. Addressing tunings and their stacking should go hand in hand with armor plate rework, because without tunings demob-immune 100kph heavies would be even worse to play with and against.
ALTERNATIVELY:
Revert the balance patch, address ECM tuning (35% strength increase, no drawback) and we will be in a much better place.