I have to second that. If it's immune to both rockets *and* shells, then it's more of a hack than a unit, as the only counters are suicide cycles, auroras, or lots of bullets from helicopters.
There's an interview with Nermal, one of the developers, who said that if the Overlord and Leopard IV meet, the first one to shoot wins.
Don't get me wrong, all the other changes you made make perfect sense.
Middrock
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