Just for the record I am using acutte matte screen/ split image and either pme 90 or wlf.
I suspect the "problem" is me not the back. I tend to shoot mostly hand held so exaggerate the problems, if I was locking down on a tripod I am sure my hit rate of focus would increase and, as an amateur, I don't have the daily throughput of say DeeJay where constant use improves consistency.
As I posted don't underestimate the quality of the old glass, some of it not so old really, you can pay so much more for the newer stuff and not get the look you love/need. For landscape work in particular remember the new glass is optimised for a closer working range the old for infinity (macro-planar excepted
).
Wouldn't it be interesting if a new light tight box, optimised for digital, could be made, to fit between the new high res. backs and our legacy glass ?