It's normal for that yeast. I use that for my Wit's as well.
I will be brewing one in a month and will ferment at 65 F ( Will's Swill ) as well. Usually, I brew the EXACT SAME beer only when it's hot in July/ August. Free rise fermentation at 75 F ( Summer Swill ). 10 or so degrees makes a big difference.
TOTALLY different beer with the higher temps. Give it a try and see which beer you like better.
Good Luck & Enjoy!