Well I used nothing but 20 pounds of chestnuts and 5 pounds of honey for a ten gallon IPA recipe almost a month ago. I took a different route then some others and tried to get most of my fermentables from the chestnuts, rather than adding other sugars. I did everyting you did with the chips, minus the pectinase. I did bring it back up to 150 for an hour before I sparged, but I don't really know if it was necessary after further reading. I tasted it before dry hopping it a week ago and it tastes great. I hope to keg it in a week or so. I am interested to hear how yours turns out.