Why even put a tldr if it gives no info at all? Just dont put a tldr.
Anyways, there is a problem that you are SEVERELY missing especially with the adc and support recommendations. You are only concerned with if the enemy adc is ahead, they should have pricier items. What if the ADC is behind? If all adc items are increased in price to keep a fed adc down, what do you think it does to an adc that is already down? This would make them nearly irrelevant even worse than a shut down adc is already.
Junglers healing cut down a bit could be an option, to be honest with Sion jungle i can do a nearly full clear, grab scuttle, gank bott or mid (since i started red), gank top if i ganked mid, and then take krugs and then wraiths and wolves again and be level 6 while everyone else is level 5 and that is my first back. Most junglers have some built in extra damage, or has %hp damage abilities, and when mixed with the Hunters Talisman makes the wraiths (a previously hefty task) a walk in the park if anyone has any aoe. The smite heal can be cut down and slow the jungler down....... but then again, at the same time, what about those junglers that are slower in general? Jarvan and Shyvana for examples are slower than Kayn and Amumu and Elise for examples. This is due to their lack of low cooldown aoe. This also means they take more damage as well, they need the extra heal to help keep up with the faster clearing champions.
You neglect to see how that change might affect the people whoare behind..... you just want to take out the ones that are doing well and have no issues shooting the person who is not doing well in the foot.
I have not seen the new rune yet so I can not comment about that really.
The tower gold, could be an idea, but the gold is usually shared..... not often is the first tower gold only given to 1 person unless it is a top laner and they stomped their lane, or the adc and support stomped lane. Which happens but not often that i have seen.