Bots need to either get reduced kill gold from your team or be more affected by negative bounties.
Something I notice leveling an account and playing TT intermediate bots is that bots actually get pretty hard to deal with if they get a lot of kill gold on top of their normal passive gold. They end up scaling a LOT faster than you'd think.
This is, of course, only a problem if the bots are getting an inordinate amount of kills compared to you, which happens when your team has multiple bots of its own.
It's just a tad frustrating is all.