I am getting ready to bottle my 2nd batch. My first batch was a Nut Brown Ale kit. It was in the ferminter for 2 weeks and sat in the bottle for 2 weeks before I tasted. Tastes good but a little on the flat side and not great head. For priming I used 2/3 cup corn sugar dissolved. The batch I am getting ready to bottle is a Porter recipe and has been in the ferminter for 2 weeks. any idea how to increase carbination?