have you tried the FOA coils ? 550 x14 and are they 4" coils ?
I'm using them now, by far the BEST I've ever tried and used. I'm pretty sure the inside ID is 3", but the top of the coil is not wound in a pigtail like stock or Calmini's so some modding must be done. Mudchild on here makes and sells a great aluminum adapter that works with the FOA/ Suspension Specialist coils.