Summoner Spell Improvements

Hey guys. Just some ideas here about how to improve the summoner spells and perhaps make some of the less popular ones more viable. Let me know what you think.

- No Change.

{{summoner:10}}{{summoner:2}} - Removed.

- Shield strength reduced to 80-350 from 115-455. Duration increased to 3 seconds from 2. Now removes all disables and debuffs and grants 50% Tenacity for 3 seconds.

- Movement speed increased to 30% from 27%. Duration reduced to 8 seconds from 10. Now grants 30% slow reduction for duration.

- Mana restore increased to 50% from 40%. Now grants a 40% reduction in all affected champions' current cooldowns (summoner spell and active item cooldowns not included).

I was going to propose a buff/change to clairvoyance, but I just can't think of anything unique enough. With the new trinket system in place, clairvoyance can't really behave as anything other than a much better trinket, which isn't stand-out enough to choose over something like exhaust, heal, or ignite imo.