Marksman Burst/Healing Delay

So, some thoughts into how marksman damage is handled, just to try to ease down some of their burst damage/healing. Im not saying markman are OP, just giving some tuning ideas that could be worked with to slow down their upfront burst.

UNIQUE PASSIVE: Critical strikes deal an additional (50% Total Attack Damage) physical damage over 5 seconds. Stacks any number of times.

synergy with would need to be looked at, but this at least takes down some of the burst

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line Lifesteal --> Blood Tribute: A percentage of physical damage dealt is stored and used to heal the user for up to (20 x Level) health each second.

Storage amount and restoration could obviously be looked at, but in any case should reduce burst healing.

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line UNIQUE PASSIVE: Gain up to 40% bonus armor penetration over 4 seconds while in combat

To give tanks some incentive to build armor and engage

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line +10 lethality (halved for ranged champions)

Pretty straightforward nerf to ranged champions using lethality items