Thank you g2florette, joel and Abrax,
I think I will go back to softies on the Dual this season, and try and get an EC4 or similar to mount the hardboots on. From what I recall, with my softies (Burton Driver-X size 12), I need to apply >40 degrees just to avoid boot overhang on my Dual 175.
Good comments about the stance, I started quite narrow, which helped with board flexing during EC, but made it hard to manage in bad snow. Wider stance helped with control, but I felt added to feet stress in lumpy snow. I will try playing with that more this season.
Some things I learned about myself last season (especially after attending the Carving Masters in Solden) that I need to improve this season..
1) I have proportionally long legs for my body, so I have trouble getting low down before the turn especially with backside. I need to work on this a lot more. My centre of gravity is wayyyy too high.
2) I don't rotate enough, and I rotate too late, on backside.
The Carving Masters event allowed me to try out different boards (mainly Oxess), which is a different philosophy (narrow boards, higher angles) which favours a hard locked forward boot and a more flexible/loose rear boot. It was quite interesting riding this style (significantly, the higher angles made it easier and allowed me to get better/lower at backside turn, and appreciate having a lower centre of gravity). Also I guess the ideal steepness of the dedicated black run we had helped a lot as well. I wonder if trying out other (narrower) EC boards first helps with Swoard learning??? Interestingly the narrower boards are also quite good in lumpy snow conditions, less pain on the legs!

I hope to attend a Swoard event this season, to learn Swoard's focus on technique, especially rotation.
cheers,
Slayer.