How to buff/change all summoner spells without breaking them to make them more viable than ignite

As the title says...

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Heal increased from 90-345 to 150/250/350/450 (Levels 1, 6, 13, and 16)

Cooldown decreased from 270 seconds to 210 seconds

New Effect now ignores grevious wounds

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Movement speed increased from 28%-45% to 45/50/55/60% (Level 1, 6, 13, and 16)

Duration increased from 10 seconds to 15 seconds

Cooldown decreased from 180 to 150

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Shield strength increased from 115-455 to 450/475/500/525 (Levels 1, 6, 13, and 16)

Shield duration increased from 2 seconds to 6 seconds all ranks

New Effect Upon falling below 30% health, negate any physical and true damage for 3 seconds all ranks

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Damage reduction removed.

Slow increased from 30% to 60% all ranks (Levels 1, 6, 13, and 16)

New Effect Reduces the enemy champion's AD by 30/40/50/60 (Levels 1, 6, 13, and 16)

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Channel duration decreased from 4.5 seconds to 2.5 seconds

Cooldown decreased from 360 to 300 seconds