Feedback about Cassiopeia

After patch 4.21, I played a couple of games with Cassiopeia. I would like to congratulate Riot because I think Cassiopeia is becoming slowly more playable than after his rushed rework.

Now, I would to share my thoughts about 4.21 Cassiopeia, that I came to mind during vs match-up. I think that the new mechanic on E stimulates Cassiopeia to trade, but I noticed some issues. In this match-up, started + and I + . At level 2 I tried to Q Katarina to get the movement speed buff and EEE, but when I tryed to close the gap she barely disengaged me walking. She had 365 MS, and I had 402 with my Q, but that difference of 37 didn't seem enough considering I don't ignore minion collision, so I had to do slalom between minions and I couldn't hit more than 1 E (sometimes nor one). I think that this is ridiculous. should rekt melee champions. If she has these problems with them, she can't lane versus ranged champions. I thought about it and I would propose one or two "palliative treatments":

1. When Cassiopeia Qs a champion, she ignores collisions
2. When Cassiopeia Qs a champion, get 4 seconds of MS buff instead of 3, so I can try to hit another Q to chase my target and try to trade.
3. When Cassiopeia poison a champion with Q and get MS buff, that MS timer is changed to 3 if you Es a target.

As I said, I think that the main problem isn't the % of MS buff, but the duration. I think that the 1st or 3th solution would be perfect. Cassiopeia can trade more, but at the same time she's vulnerable while chasing.