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You sure you have enough shackle length to allow the springs to go completely flat? If not, the springs "bottom out" while still curved, instead of going flat or reversing, and this can and will break them.
Take a string and run it along the top of the spring from above the eye center to above the eye center.
Then tape one end down above the eye center.
Pull the string tight.
Now check the shackle swing to see if it will intercept the string. You can simulate a shackle with cardboard, using the bolt centers as the pivot point and arc.
If the shackle will not reach to the end of the string, you need longer shackles.
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