I bottled a Saison a few weeks ago, and I have had to geyser on me when I opened them. They were both in shorty bottles and had about 1/2" of headspace in them when I cracked them. The kit came with a pre-measured mix of corn sugar and DME for priming. I am worried that I may have too much priming sugar due to and error when the mix was measured. By the way, I was DEFINITELY at FG when I bottled. It didn't change for a week and finished right where the kit said it should. The beer does taste good too.