You didn't mention it, but I'm curious as to what sized piers you used for pouring the main deck's column supports?
A few years ago, I designed a large deck for a buddy of mine in Colorado (elevation 8800 feet, 110 lb./s.f. snow load). My conservative design came up with 8" sonotubes for the main deck, and 6" for the stairs. We went 4 ft. down with all holes, and used elephant paws in the bottoms of each (they're adjustable, to fit the sonotube size) to minimize concrete waste. It was probably overkill, but we used 3 No. 5 rebars in the big tubes, 2 No. 5s in each small. Worked our butts off, getting the readimix from the truck (in wheelbarrows) in the front of the house to the tubes in the back yard. I think that was the day I began to realize what a wuss I was.
Suggest you beat on the tubes (for concrete consolidation), "gently" to prevent knocking them out of plumb, if you don't have a spud vibrator.