. ZULU is 10.3 DME MIA. ... the distance between MIA and the IMA DME is 1,921 ft.
On what do you base that? As nearly as I can tell MIA and IMA DME are coincident. On the ILS or LOC 24 profile view, the the LOC MAP is D0.9 IMA, and is 0.7nm from the runway threshold. That indicates the threshold is D0.2IMA. Looking at the VOR Z Rwy 24, the MAP is D1.8 MIA, and 1.6 nm from the runway threshold, indicating that the runway threshold is D0.2 MIA, also. Unless I'm missing something, I don't see any way that there can be 0.3nm difference between MIA and IMA distances.