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In producing video from different cameras or several sources I would adjust the vector/waveform monitors for each bit of video. Constant tweaking job, but the results were worth the effort.
With stereo reel-to-reel tape, the timing weakness was head alignment between record and playback heads and between different machines. Despite the fact that there were standard test tapes for setup, tape was just too flexible to remain exactly on coarse and azimuths needed to be watched on an oscilloscope, another example of a timing problem.
The fragile nature of timings in multiple-same-frequency-transmitters reminds me a lot of tape head azimuth, in that it is, as RFB points out, very close to the edge.
The central timing approach of the Rangemaster is probably the most stable way to manage the RF part of the problem.