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Why is not recommended? - if you ever want to shoot it at people <- (games) you'll need to either switch the spring out or use another AEG. But you don't plan on it so really you're all good.
Does it over stress the gun? - not over stress but it will be putting more stress on everything than what the m90 spring would be. (wear and tear of gears and motor will happen faster)
Whats most optimum spring to balance it out? - I'd say keeping it around 400 fps (m120 - m130 spring) this is of course my opinion from what I understand of these guns. Amos will know better than me though.
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