| So the formula is the area of the calliper pistons divided by the area of the master cylinder.
A std fireblade is around a figure of 34.5. An nc 30 is around 31.5.
Brake levers are about feel.
Too great a number and you have a hard lever, but no feel.
Too low a number and you have loads of feel but of course too much travel!
I would suggest from what your saying Frank, your master cylinder is too small a bore to cope with your 6 pots. ( what a std 16mm ducati master cylinder bore?)
Thats easy to see when you think of the amount of fluid required to move all those extra calliper pistons.
I bet your ratio is low 20's.
Brembo 19/18 master cylinder to sort me thinks....... | 
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