Phillip is correct, there is a miscalculation.
The mistake used is 0.064 PED = 0.064 PEC, which is clearly not true.
F106 decay cost per drop is 1.799 PEC.
Enhancer cost per drop is 0.016 PED per ehancer slot(according to OP's break rate and MU), therefore 0.064 PED if 4 I-IV slots are used...