I have poured at 125, 130, 135, 140, 145, 150, 155, 165 and probably everywhere in between! If I pour 140 (about) and above I get sinkholes, and any lower and I get weird white spots (I call them milk spots cause it looks like milk!) Not like frosting, it's different. Maybe I will try more 4630. I really didn't want to go with more paraffin, but I may have to to solve this problem. 30% is just harder to figure too. (for me, anyway), lol. Oh, and I am working on the 8oz. sq. mason with this combo. TIA:)