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I'm not sure I buy into the idea of rear spacers causing springs to sag. If front and rear are raised near-identical amounts, the weight on the rear springs will be the same as before. But, if you do not lower the bump stops the amount of your lift, that would introduce additional travel on the spring which may or may not cause fatigue (and sagging) depending on how often you kissed the bump stops. The rear springs are notorious for sagging on their own and I think the spacers are often unjustifiably given a bad rap as the cause.
Front spacers that preload the spring are a different matter. The preload is quite a bit over stock and that could lead to increased spring fatigue and sag.
I've been running 1.5" spacers up front and 2" in the rear for over 6 months and haven't observed any sagging in my 10 year old factory springs. I suppose time will tell...
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