Believe me, I wish it was that easy. I took all of my molds, none of which are new, sprayed them well with cleaner, wiped them out really well...got the holes. So for the next batch, I did nothing. Not even a wipe out. Holes. I'm pretty sure temperature isn't the problem since I've tried all ranges. At one point I thought maybe it was the FO - it was older. But the last batch was made with brand new FO. I don't want to keep belaboring this issue because clearly there is no easy remedy. I'll keep testing and when the holes disappear I'll let you all know what the magic solution is. Thanks for all the suggestions!