The reason your shocks feel wrong with 1.8 and 1.7mm pistons is becasuse your using tapered pistons.
With tapered pistons i would try something like 3 hole 1.5 in the rear and 2 hole 1.6 in the front.
Your currently using my set up which is for standard pistons, not tapered.
I won't be at Batley tomorrow unfortunately.
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