This "bitterness" your talking about may be from all that extra sugar you added. Not such a good idea to add too much. I have this same problem right now I suspect because my calculations were off and I ended with a much smaller volume than the 5 gallons I was hoping for. I added an amount of sugar to it that was for 5 gallons and I think that there is too much sugar in it and has left a pretty bad taste in my beer.
On Deck: Double IPA, GTBT V3
Primary: GTBT APA
Bottled: GTBT V2, GTBT V1, Black IPA, Centennial IPA, Pumpkin Ale, Badboy IPA, Simarillo APA