Not sure why your building the shocks any different from kit, I've now run them like that as after lots of testing and trials I've found that is the best compromise, if I would recomend anything it would be reducing the length of the front shocks to reduce droop to calm the front of the car down.
I'll PM you my contact details and we can have a chat about the car.
Nick Caro goes to Worksop and we are in constant discussions and development of set-ups, I'm sure he'll tell you what we know about the car.
Any help at all I can be just ask mate, the more K' cars on track the better as far as I am concerned!!