Occasionally, I have an issue with corks staying seated in a bottle. I use Size 9 straight cork. I've purchased most from Kraus. The directions with the corks say bring water to a boil, remove from heat, added corks, cover and let steam for 2-5 minutes. I am using a hand corker. The corks go into the bottles fine and I have never had one to leak, it's just about one in every 8-10 bottles the cork will start rising back out of the bottle. I don't use any particular kind of bottles, all are just standard 750 ml. I tried putting the corks in dry without steaming. With some difficulty this worked on some some bottles, but I couldn't get the corks in others. None of these corks came out. Would steaming the corks for a shorter period help? I wouldn't think there would be a significant differences in the individual cork or bottle opening size. Suggestions? (besides buying a new floor corker)