Try a chilled glass/not frozen, pour the 1st couple ounce out or drink them , then pour a complete pint. I've always noticed that if the 1st couple of ounce are foam, the whole pint ends up being flat. I suspect its becuz you continue to pour over foam instead of over beer.
Primaries: Mojave Red (AG)
Kegs: Hibiscus Saison (AG), Orange Kolsch (AG) , Cocunut Porter
Future Brew: Wee Heavy