If I read it correctly the Stratos manual / tech data states that the stock spring compresses 142mm under a load of 300 - 330kg that's a spring rate of 22kg/cm or 120/130lb/in - which from my calculations is a compliant sports car ride stiffness on a strut. - so sounds about correct.
325lb/in at near 3 times the standard stiffness seems a bit on the high side - For a 1000kg car with 40/60 distribution my calculator throws out 250-275 as being in the firm sporting area.
350 lb will only have 1.75" of coil crush so if you have more than 2" of droop in roll or bounce the spring will be unrestrained. Stiff springs are all well and good but you also need to take into account the suspension travel you have on the strut and the bounce and droop you want to have. Having a wheel in roll unsupported and just bouncing against a loose spring is not good.
I always want to have at least 3" of bounce and droop with the spring restrained in that movement - for 3" of coil crush - and no preload on the strut - assuming adjustable platform of course - you need a spring of 220lb/in range - the coil free length etc will depend on the open and closed lengths of the strut and position of the bump stop.
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