First Blood Tower Gold Suggestion
Delay the reward. Make it so that if you take a tower, and it is before 12 minutes into the game, that the bonus gold received is delayed until 12 minutes into the game.
It's the same amount of gold. We just don't have an extra 400 gold going to the team that shoves their bot tower down first at literally 5 minutes in.
Sure, it may be slightly unclear, but you could put it into the announcement upon tower kill. "Will receive 400g at 12:00", and we kinda passed the gameplay clarity excuse back at "bot tower is inexplicably weaker than the other towers with no indicator that this is the case, because reasons." Not even a little glow on towers to show "this tower is fortified" on top-mid towers, that gets removed when they stop being fortified.