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Dual piston help distribute the force more evenly on both pads. A single piston forces the entire caliper to slide to one side. You won't get more clamping force by switching to dual. You need a higher pressure Brake Master Cylinder to get more pressure. Switching to steel braided line helps as it doe not expand as much as rubber line
A bigger piston is better than a smaller one as it distributes pressure over a larger surface. What you want to look at is the surface area the piston contact with the brake pads.
Other things to consider, brake rotor, fluid type, fixed or floating type caliper.
Hope this helped.
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