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I think I've found a remedy. The back 5" of the 16x16x2" pavers sits over loose gravel. That allows shifting as a person comes down the steps. I had rebar (3/8 and 1") cut into 10" pieces. I am hammering 2 rebar at the back corners of each paver,to level them and provide better support than the gravel did. ALSO I found metal L braces, about 3" on one side and about 2" on the other. Using 3" deck nails in the 3" side, I am attaching 2 to the front landscape timber(where the toppers meet), and attaching 2 to the back landscape timber(at the ends)to box them in so they can't go anywhere. The ones I have finished have a much firmer feel as a person walks down the steps.