Janna Ult Change Suggestion

Hey Guys, For Janna players, there is currently no reason to keep the ultimate activated. Often they use only the knockback. For this reason, I thought about some changes about Jannas Ult and want to see what you think about it. First off, this probably seems to be overpowered as buffing an already strong ultimate seems to be stupid. But in fact, I only want to buff the part about Jannas ult, that is quite weak and add some utility to it. So here are my suggestions for Jannas Ultimate

1. While activated, Jannas passive Tailwind has an increased range (1250-->1750) and the movement speed bonus is doubled (8%-->16%).
2. Jannas Ultimate slows while activated: 20-40% slow depending on how near the champion is to the centre of the Monsoon.
3. Heal AP Ratio reduced (50%-->40%).

This would give Janna even more decisions and ways to use this ultimate. And it would fit quite well to the main topic of Season 6: Making Decisions.

Please tell me how you like these changes and sorry for my bad english.