Did you find them to be too narrow or too short in the length?
The length was really the biggest issue for me. I'm a slightly small 10.5, but they were definitely too small for me. I have a pair of 10/10.5D EG Dover's on the same 606 last and they are about half an inch longer and slightly wider. I believe the chukka's are good for a true 10D US, but nothing bigger.