I've never heard of a spool having trouble at those temperatures so that's surprising. If it's what the manufacturer says to do, then go for it. If it backfires, contact support - you were just following their instructions.
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My dryer only goes to 65 but that's what I dry my overture petg spools at and I haven't had any issues
I've never had a problem with drying Overture spools before. I concur that you should be able to follow the manufacturer recommendation.