It could be a tuning problem, the more aggressively cambered the more likely the tips will fold and the harder they are to unfold. You could try moving the knot on the C pulley line ,with Z under it, 2cm at a time up towards the kite or the front lines. This will loosen Z giving more negative camber or reflex and may limit B a bit depowered making the kite sit back more and be more stable. Just make sure you compare both sides so the changes are symmetrical. Having said that tip collapsing and bridle catching is a normal everyday thing for foil kites, some do it more like the higher performance race kites such as your R1 and some hardly at all. Some untuck easy and some don't. Some catch bridles easy and are hard to unstuck and some don't at all. You may as you found have something that catches the bridles, not a very good design, and you may want to cut that bit off like you asked.
Generally to untuck a tip you want to back stall the kite into the window, having a bar with backstall setup is great to do this or to back stall before the kite flies out of the window and then collapses. You can also use the rear leaders like Rob Whittall shows in https://www.youtube.com/watch?v=dUhznfdatmw
. The biggest problem to handling foils especially the high performance ones is they fly out of the window, this is actually why they are so high performance in the first place and desirable for this trait. You will want to keep some rear line tension to prevent them doing this. Shorten your rear lines or lengthen your trim or fronts lines so you can do this with just sheeting the bar in. This is what I call backstall on the bar. Some lesser performing foils like the A15 tend not to overfly, but still the trim state of the mixer is a large influence. Even then for the more user friendly foils using backstall during normal riding is of great help. You can drop the kite in and out of the window to generate power instead of turning it thru the window, you can shut the power off in the middle of the window by backstalling it, you can position the kite directly downwind like a sail, you can position the kite as deep as you like to make it more stable or drift better, you can even fly the kite backwards generating power in reverse like on a wave!