In reply to VictorM:
WRT Technique, I'm usually quite intuitive with this sort of thing and know I would have been trying different positions to eleviate the discomfort so suspect the correct foot position was one of the many causing discomfort as opposed to the cure.
I recall at times actually using the inner most toe spikes and those on the inner front of the crampon to relieve the discomfort caused by using the front two toe spikes, having tried many foot angles with the later.
It appears to be a case of having reached the limit if what the hsnwags are suitable for which tbh, is actually pretty useful to have found out early on.
I'll use them for the rest of the winter noting their limitations and then retire them to spring/summer use, probably going for some b3's next winter.
Thanks for your help.