At 150 lbs you will not achieve the correct sag numbers, they are setup for 200 lb riders from factory.That link has an excellent write-up! Better than instructions I received with my Performance Works shocks.
When I had mine I had a hard time getting the correct sag numbers and I am 160 lbs.
I put a ohlins du515 on the back but never got round to changing the springs in the front.
Call Dan Kyle as he can help you out.