If the springs were rusted, THAT was the problem and the reason they collapsed. And I promise you that having the springs fully-compressed wasn't the reason they rusted.
Do what you want, but a) springs don't need to "breathe" or otherwise recover from a period of compression, and b) as long as you don't over-compress the springs and exceed their elastic limits, leaving them fully loaded isn't going to shorten the spring life one iota.
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