pflower and david, many thanks. The consensus seems to be H has no substantial advantage, or disadvantage, than V handheld. The caveats of technique and the superiority of WLF in both appear to be the deciding factors. I suppose in looking to change no worse is OK. It is not my first priority but was important.
FWIW I did some tests, subjective
, using WLF on the V and was convinced that 1/30th was usable, especially with bracketing, if great care and attention was taken. (100mm Planar at infinity using some transmitter aerials we conveniently have about 5 miles away.)
I have obviously been too slapdash with the digital back and Doug was right, I am tempted to add as usual, oh go on I will, even the "soft" are acceptable for say web viewing but you wouldn't want to print them larger than 10 x 8.
Many thanks to all contributors I do, and I'm sure others as well, appreciated these civilised discussions here.