I brewed a pumpkin porter with a OG of about 1.080 and a finishing gravity of about 1.018. The abv is a little over 8%. I kegged half and bottled half. Sadly, the bottled beer is very flat. When you have higher alcohol content beer, should you repitch yeast? I didn't use a yeast starter, just pitched 11/2 vials of yeast. Most of the fermenting finished in a few days. I left in secondary for 1 1/2 months. Been in bottles for almost 4 weeks.