I just used the White Labs Kolsch strain (029?) for a DIPA and I was very pleased with the results. I fermented a little cooler than you do because my ferm chamber was tied up with other stuff, but I would go for 62 if I did it again. I liked the esters I got and would have liked a little more of them.
Yeah, the reason I said that is that I did an american wheat and wanted to go REALLY clean, tried it at 58.F and got a really strange lychee-ish winey aroma. Only beer I ever made that I couldn't finish. What temp did you do yours at?