About ban
You're thinking about increasing bans number, but afraid of the bad impact on the time. I would suggest an idea that theorically should low the time increasing bans. 5 bans every team (1 per person), but the two teams do it in the same time. I mean: the ban phase starts. 30" for the first player of every team to ban a champ (if someone locks the ban the other team do not see the champion banned like champions' pick in blindqueue). 30" both team see the first ban and must ban a second champ. Etc. This way we would have 5 "ban times" against 6 (3+3) that we actually have. My english sucks, but i hope the idea itself doesn't xD