Now that I look at the picture I see that I was generous with coil bind at 40, its actually 38 lbs.  

The quality control with this product is woefully inadequate.  Perpendicularity is very important.  If the ends of the spring are not ground square you will have rubbing and binding.  The spring may not apply pressure in a linear fashion.  The crude grinding on the ends of the spring create all sorts of stress risers.  Some of the springs going into coil bind before you reach installed height force is a recipe for failure.

When I need new clutch springs I will be looking to OEM or a different aftermarket supplier.