Summer Ale FG Question

I just checked my SA Summer Ale clone's gravity, and after a week it's at 1.030. The OG was 1.056. I've been fermenting this at 66 - 68ºF. When I opened the fermenter, the krausen was still high and thick. I'm going to let the temps come up to 68 - 70ºF for a week, and I gave the fermenter a good swirl. The yeast was White labs belgian Wit WLP400, and I used a 2000 ml starter.

Is this high gravity likely due to low fermentation temps? Are my new temps in line for this yeast, and unlikely to produce off flavors?

Colder temps usually mean a longer ferment, but 66-68F isnt really that cold. Check the FG in a week. From what White Labs says, you should ferment a little warmer.