I hit about 2 hours today with Irukandji in the crosses for Tourna Quasi Gut Armor* mains (54/52) in my Shift 99 300. Stringbed felt very solid (with a fairly deep tone when striking the ball) and comfortable. The main issue was that the mains were moving after pretty much every ball (just hitting against a ball machine), so I was presumably not getting much in the way of snapback. I might just cut it out and restring higher and without a tension differential, but open to any suggestions if there's an obvious issue that I'm missing.
(One caveat here is that I strung this myself as a novice stringer and this was probably my fifth racket. I
think that I gave the strings enough time to settle while being pulled (Alpha Pioneer DC Plus drop weight), and nothing looks obviously
off like for my first two attempts, but I can't be totally sure that I didn't just flub something.)
* Rationale for testing this combo comes from previous observations about QGA's softness, where even Isospeed Cream was inducing notching after a fairly short duration: Post in thread 'Tourna Quasi-Gut Armor 16g'
http://tt.tennis-warehouse.com/index.php?threads/tourna-quasi-gut-armor-16g.739216/post-17162449. Basically, I wanted to see whether Irukandji, being very soft (even if not quite to Cream levels) combined with its flat surface, would delay notching and extend snapback/QGA lifespan. But, I suspect that any observations re: notching at this point, considering the movement issue, is not really informative.