Lacto sourness or hop bitterness?

[Culbetron]

I brewed an oatmeal stout that has been fermenting for 3 weeks. It's down to 1.012 I tasted it at 1 week and at 3 weeks. Both times it tasted quite bitter. About the same level of bitterness. I'm a little worried about having a lacto infection - maybe that's causing the sour/bitter taste. I also realized that the EKG hops I used (2oz at 60 mins) were actually 2% higher in alpha acid than the ones I used to calculate the recipe. So it's probably quite a bit more bitter than I was planning.

I'm having a hard time figuring out which might be the issue. Any tips?

 

[fartinmartin]

The taste after three weeks will not be good ! That's why the beer has to finish, be primed, conditioned, and matured, then tell about the taste.
Whenever that taste test is, it will be too soon.

 

[Culbetron]

It was an infection =(