In contrast, I can't stand 1UPT and is the reason I refuse to touch CivV or Beyond Earth no matter what
10 units is a pretty small number to dislike though!
Are you using Realistic Timescale in the BUG options? That should help them if they're falling behind for whatever reason.
Not sure what you mean by 'disable debug' - it's always off by default, you have to enable it yourself, and it won't help the game any
(other than showing you the world map, letting you peek into cities, see all resources, what techs they have, and holding down keys to see AI's planned routes for unit stacks, etc). Enabling it or keeping it disabled doesn't affect the AI at all, I merely mentioned it so you could see what was causing the AI's cities to be unhappy