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Jeff
I too have relayed old jobs where the tops of the pavers have been disintegrated and the bottoms are fine when on limestone screenings. Every job that the bottoms were disintegrated the screenings were always saturated wet. That may have a lot to do with it. With poured concrete the water can't get through to the base like with pavers. Around here it is always the surface of the concrete that is a mess because of salt.
When I used limestone many years ago I hated the switch to sand. Limestone was so much easier to work with. Grade it level, pack it and lay stone. You could walk all over it when working without any ill effects.
I only use about 1/4" of sand to bed in my pavers. I feel if you use any more than this you increase the chance of failure. (use a grade rake and lie on my belly alot to check my grade for dips and high spots. Got to have patience and a bit of an eye for this)
All of your leveling should be in the gravel base not the sand. The sand is just to bed the paver and lock it.
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