Let it go man, 11 days is hardly long enough for proper attenuation. 62-64 is kinda low for a wheat beer as well. You might bump the temp to 70f. Give it another 10 days and recheck. The attenuation of the yeast you used is about 70% to 75% at best. That means you should expect no better than an FG of 1.012. If conditions aren't perfect, you could end up at between .012 and .022. You have a ways to go. Relax, have a homebrew.
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