Level 8 Cass with a 75% winrate and ~7.5 hours on her...
I disagree with pretty much every single point you make about her tbh.
I felt like she was much stronger in Power Capture than point capture, because her mobility and ability to pick off high value targets, while also being able to very quickly and efficiently clean up cells.
I never had this bug with swoop, if I was locked, I went to the target. Anytime I was unlocked I went straight. And you also are likely undervaluing the damage double swoop adds to a combo. You can swoop, evade, swoop into rake and then clean up with AA's in any area where super jump and your B will get you out of trouble.
Rake is already incredibly strong and you can CC anyone against a wall. The stomp mechanic you talk about also exists if you are airborne vs. airbone opponents.
Hightail is tricky at first, but allows for way more interesting combos once you're able to orient yourself correct. I think this adds for a level of skill expression, also make it harder for certain characters to track you.
Feather darts feel incredibly weak if you don't buff them, so I use all 3 of my mods to make them stronger. 20% extra range, 7.5% damage on basic attack and the 7.5% increased damage after casting swoop. This allows for you to very quickly single out any squishies who step near a wall with swoop+rake, followed by AA's as they try to evade away.
Blade dancer>Dive bomb if youre able to constantly have power ups and isolate 1 to 2 people reactively. I think dive bomb overall will end up being more useful at top tier play, but I used Blade Dance in pubs and stacked 4's incredibly well.
I would hesitate to call for any buff/nerfs on any character until we see 1 or 2 more Fighters in the overall roster.