what version are you on? is it the version with momiji's needle attacks or just her web? i couldn't get it to replicate, the hitstun stops being long enough at 18 hits (though it's certainly enough to defeat a lot of enemies)
this route with katana [5L > 5H > jump > j.L1 > j.L2 > j.H > landing > repeat...] loops, though it also becomes air-techable (combo counter is black, and you can even see the hitstun meter under ribbon's portrait doesn't even stay on screen anymore, the ai in this case doesn't try to tech at the moment making demonstrating this easy) (it also starts itself, since j.H is what ends up launching)
there are a few attributes that decay combos (juggle height, gravity, hitstun and hitstop), not entirely to remove infinites (which i'm ostensibly fine with), i just want figuring out infinites or loops to have some friction to it. the little meter under the combo counter also shows the current decay rating.