Has anyone else found it near impossible to win from behind?

I've played a few games so far and in all of them, the team that got ahead first won (by ahead i don't mean First blood. I mean one team is noticeably stronger than the other even though they are around (with the losing team slightly less) the same level average as a result of having more kills/turrets taken). So far I have noticed a substantial snowball by the team that eventually wins the game.

My hypothesis as to why:

• New AD reworks and item changes have made objective taking too easy.
• AP burst champions are practically useless now
• Removal of or nerfed/increased the cost of mana regen items makes mna heavy bruisers and AP users less threatening since they can't poke or burst multiple times(looking at you pantheon and cassiopeia)
• Minions are WAY TO ONE SIDED. It was a neat idea to add a minion based function to the game, but this one is really broken to the point of unfair/game breaking. Not only do they buff damage and resistance when on the winning side, but they also unintentionally make it near impossible to take that lanes towers as the losing side since you have to push the wave fully up to the tower.
• CRIT is too powerful with the new Keystone masterys