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I'm sure if you look around there is a formula out there as to how heavy you need a flywheel of a given size for an engine of a given size at a given speed, having it hard to drive to me would be a giveaway that it's to light as it's not absorbing and giving back the energy between firings, this was part of the idea behind having multi piston engines and the V8 engine design is that you have the firing of pistons happens often enough that your power output over the rotation is high enough.
The only real disadvantage of a heavy fly wheel is that it takes more energy to get it moving, but as long as it's balanced it will maintain it's momentum, it's not like the rotating mass of a wheel and tire, because those are unsprung weight.
So yes, a 1,000 pound fly wheel would be nice, if the engine had enough power to get it moving and if you had a CVC transmision that could work with it, because the cranks shaft is always speeding up and slowing down depending on what part of the cycle the engine is in, slowing down on a compression stroke and speeding up when it fires.
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