The viegar stun is so hard to control that it is making me cry

I think I am so use to the edge stun that its going to take me a long time to get use to this new stun. I had a game with kat who had low health and I was thinking ok I just need to stun her and kill her with my ult. When I was about to stun I was thinking the edge stun and bam she walked away safely and in my head I was like "NOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO" . Then I was thinking ok I have to trap them so that they walk straight to the stun. This method is really hard because sometime they would be in the aoe stun circle and they would be about to hit the edge and then bam they stop and I already release my e onto the spot where they were about to get stun. So they stop and go backward to doge the E and in my head I was like "oh shit". After, the stun goes away they come after me sometime I would go away safely but other time I will die. The new stun is definitely harder than the old one.

Also, want to mention about the double q if anyone notice you have to auto attack the minion that is behind the minion that is being attack by ur minions. I notice that when I q the low health minion (the minion that is being attack by ur mininons) it will kill it but also lower the health of the minion behind it. Causing ur minions to attack it so I would either have to auto attack it or else my minions will kill it. This is kinda anoying as I am losing minion before I can q them.