Since I started brewing in January, every single batch (6 so far) has come out flat. I've had a couple come good after a few months in the back of the garage but for the most part, it's all flat.
At first I was underfilling the bottles quite significantly but I've since begun using a bottling wand & filling to overflow and the results are the same.
I've been giving the partial-wort (I've been doing partial boil extract brews) a good shake & have always poured from a height. Is that enough aeration?
All brews have been fairly standard alcohol levels (highest at 5.1%) so I don't think it's that.
My glasses do come from the dishwasher but they handle commercial beer fine. The beer itself just doesn't have a steady flow of bubbles.
I get plenty of sediment sitting on the bottom of the bottles so I think it's conditioned enough (I usually wait 2 weeks minimum before opening).
What approach should I take to trying to find the source of my problem? Are there a few likely culprits I can try & experiment with small batches? Are there any tests I can do? Worst case scenario I'll have to invest in a keg setup (darn).