Have the Long Tom target the Single Largest enemy mech, or at least assign give heavier mechs more weight (lol) in the math to select a target. Shooting at 4 locust is silly compared to shooting at 2 Atlas next to each other. Additionally, ignore all enemies that are 'danger close' (within the area of effect of atillery) when calculating the target. If all enemies are too close to allied units, the Long Tom should simply not fire, maybe have a voice over saying "Enemies Danger Close, long Tom aborting fire mission."
This will prevent the light mech ball from completely mitigating long tom advantage, prevent them from kiting the shot into allied formation, and will incentivize closing with the enemy to mitigate the artilery shots. In exchange for this somewhat drastic improvement in effectiveness, have the Long tom only fire every other sattelite sweep.
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Edited by Captain Mittens, 02 May 2016 - 03:49 PM.