Hi again,
By no means was I saying that Chapman does not know what they are doing. I was meaning that it does not matter who sets up your valve springs including me, if they are not set up for your exact cam needs and no more extra clearance from coil bind than is the minimum necessary they could be done wrong. Also ask them about your exact springs with the cam profile and lift and rpm range you want and see if they are recommending this same spring.
How much valve to piston clearance do you have to the intake valves? You can possibly get some additional wiggle room there too like I said earlier, by changing your camshaft lobe Intake Centerline.
Ed