For me the rear end was packing up a little to much on rough tracks with the 2x1.6 pistons and 300cst oil that my previous starting setup used. Also in some situations the car benefits from squatting a little more under acceleration when looking for greater traction.
Going to the 2x1.7 pistons with 350cst oil improves the car in both aspects, tried larger flow area in the pistons (both bigger holes and different number of holes) however I've found 2x1.7 to be a great all round piston.
As an aside I've found the car more sensitive to antisquat adjustments since going to the 2x1.7 pistons than either 2x1.6 or 4x1.35 that I've previously run.
Hope that helps
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