What if you made these gameplay changes?
If you doubled all gold and xp from all sources at 5 mins? This has probably been discussed, idk, but the 5 min mark comes a loud gong sound or something similar to other sounds in league, ques everyone to know everything bumped up. So everything stays the same, until 5 mins then everything in the system is double, except from pricing of items of course.
Then theoretically we would have a much quicker game, and more fun fo sho. Maybe just tried as a rotating game mode, lets just see how it goes?