Hold up fella. You sure about the numbers. The standard springs front and rear are matched.
A stock rear spring on an Ohlins shod rsv is 95nm. which is a 9.6 kg/mm spring much the same as a standard front spring
If you have a 150 nm spring (not sure they do one) then here is the maths
Nm divided by 9.8 = kg/mm (105 divided by 9.8 = 15.3)
kg/mm x 56 = lb/in (15.3 x 56 = 856.7)
That means you are running a 857 lb, 389Kgs spring which i have my doubts.
Ohlins spring go up is 5 nm stages. Big jump from 95 to 150. More like 105 which is 2 stiffer than oe.