My Bike Friday Tikit has gearing from 30 to 77, depending on the actual diameter of the tires. I could stand to have a lower low and a higher high. I might switch to a 9 speed. That would get me lower low, but a higher high is a problem because 11 is pretty much the smallest cog you can get except on the special Shimano Caprio. I could go to a 54 running an 11 30 cassette and end up with a 29 to 78--looking at it, it really isn't worth it.
But, you definitely need to get rid of that 14 as your smallest cog.
Good luck.