Would charging at the end of the commute help? I had gotten into the habit of DCFC charging every other day (my commute is only 14 miles). I'm not surprised to see charging slow-down, but 57% slower? Yowza.
This reminds me that I saw a used Leaf on Craigslist, and the previous owner said he'd added a battery warmer. If I were driving, and knew I was headed to a DCFC in 10 miles, I wouldn't mind using some juice to warm the battery into a state where it would accept a fast charge.