So the last two batches I brewed (Amber and an Irish Red), I decided to use a priming sugar calculator rather than dump in the whole 5oz package of corn sugar. Both beers taste great, and I think I like the carb levels much better, but I am thinking the head retention is suffering. I poured a few and it is either really thin or non existant. I suppose it could be soap residue in the glasses, but will this improve over the next few weeks?