Yeah, I was one that lost my grip on the original question as a read through the posts
I was actually thinking about the original question then as I read down...drift
Ive flown most of the different versions of the SD. All worked & looked good on longer lines. I've flown it on 125' lines and it worked as well without any issues I remember. I'm not sure that going from 30 to 40m will make a huge difference with precision but definitely noticeable. If it is for a competition, I would fly the longest lines I felt comfortable with.