I called up chards in bristol. These guys made the propshafts and sorted the drivetrain for the james bond aston martin, and they have a fantastic reputation.
I called them up, and the chap (nigel i think, line wasn't great), to my suprise (having read so many posts about it solving the problem) strongly advised me against a double cardan front propshaft to take out the over-run vibration i am getting on a lifted range rover classic.
Admittedly he didn't make an alternative suggestion, but i mentioned the wide angled propshafts being a mixed bag with regarding to resolving the issue, and he wants to see the vehicle to measure the angles required, and come up with a solution. Could be i just caught him offguard, but I'm a tad suprised he said it was pretty much a botch.
anyone been offered similar advice? i will update here once i get his suggestion, but these guys really know their stuff, so i am intrigued. thoughts?