I had 2 x 100m lengths used for a charity abseil event and then cut it up to shorter lengths for caving (well mine stuff mainly). I have 3 x 20m lengths that get used almost exclusively for Italian hitch work on LCMLA training courses and the other bits generally do belay duties on ladder/lifeline trips.
I have not noticed any propensity towards twisting any more than any other rope. I do keep my ropes clean to an OCD level as I'm adamant that it is the only way to keep the handle of a rope long term. Did your rope get properly soaked / shrunk before first use? I am assuming the know that IH and Fig8 use introduces twists into any rope?
Maybe the core/sheath bonding construction does amplify the twisting or torqueing effect but I can't say I've noticed it. It could also be a very specific batch problem, a bit like the few km of Beal's Spelenium Gold a few years ago that was wavy and lumpy but had no strength loss. That was not recalled but was notified to customers.
Ah. No then, no noticeable difference from my point of view. I really like the stuff for use where there is sharp or very abrasive rock and with less than gentle trainees.