78 RPM for very expensive tables - DDS/PLL?

Not all shellac era grooves are the same size, and speeds varied even among the same label. Major considerations when playing old historic recordings. Besides, until British Decca/London introduced FFRR after WW II, the shellac recording did well to have more than 8-10 Khz of audio cut in the groove. Then FFRR gave us 14,000-15,000 hertz on shellac and did it consistently. And note, I like SOTA turntables greatly. They perform superbly and are superbly built. Named State Of The Art, and every bit that. But variable speed on pre-1932 shellac is an important feature. This was the time frame when 78 became standard speed for records. Flexible is a good thing when dealing with historic audio.

 

While I have all the experts in the room, can anyone confirm that the Jelco SA-750L 12" tone arm plays nice with Shure M75 / Shure M44 / Shure V15 VX cartridges and Expert stylii? The cantilevers are pretty stiff so that they can accurately track 78s at 3-4 grams. Everything I've read indicates it's OK and probably the most cost-effective arm for a reference-level 78 transfer rig that can also accomodate 16" records. Thoughts?