Ales end up always more bitter than id like

[Dara]

Try dissolving approx 6grams of sugar in a small amount of water and adding it to a 500 ml bottle of your beer.  This will take the gravity up to a ball park of 1.010 SG from 1.005 (at least from my calcs). If that reduces/improves the perception of bitterness then I'd day you are mashing at to low a temp. I'd imagine the low gravity is increasing your perception bitterness. Don't recap the bottle! As an example of a low gravity finish beet try a duvel (ok a bit sour) but it finishes around 33ibu and 1.006. Tastes fairly bitter.