Cube design for exciting games

Finally got to draft my janky, hastily put together cube this christmas and it was a blast. The drafting and deck-building was awesome, but the actual games had some issues. Many games dragged long, a few even to the last card. Some games ended up in top-deck wars that feel both random and slow. Not surprising since this cube was a quickly thrown together affair.

Now I'm looking to tweak it for faster, more action packed games with less top-deck situations. Any advice?