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Would a four piston allow greater modulation? I don't know the answer to this - honest enquiry.
Someone who knows about mechanical advantage might pop along in a bit, but my working knowledge of this is...
Assuming more pots means more surface area for the fluid to work on, and you use the same lever, then the pistons will travel a shorter distance to obtain the same mechanical advantage.
So I reckon by the time your pads hit the rotor you'd have got through more lever stroke. And when the pads hit the rotor, they'll be working at a higher MA.
Combine this with a larger contact area - more friction - and I reckon you'll be losing modulation for power. So, grabby brakes with a long lever throw I reckon.
Lethal on a road bike when you haven't got a 2.4" biting the dirt. Or tarmac in this case.
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Howard
On Me Julie's bike (with R-685) I can cover the final part of the hill upon which I live on the front wheel, which I'm guessing is because the wheelbase is shorter, allowing the seated stoppie.
It's also a lot lighter than my bike, with R-785.
But that aside, the level of modulation is what is key to not eating tarmac whilst behaving like a 7 year old on a BMX.
Would a four piston allow greater modulation? I don't know the answer to this - honest enquiry.