Help with room treatment?



I know my set up is very modest compared to some on here but I am just getting into this over the last 4 or 5 months. I built a room specifically for listening and once completed my system has sounded so much worse. Bass is worse, highs are worse. I understand it is a fairly empty room right now. After addressing first reflection points will it get any better?
Or should I return to my living room?
Rega P1
Cambridge audio Azur 740a
Cambridge audio cp1
Dali Oberon 5’s

Room is 12.5 ft by 16.5 ft

Also not sure how to add a picture otherwise I would show you

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Love the records. Did the exact same thing one time myself. This big record company VP (no kidding) was coming over, my room was all new and empty, thought I had to do something, so I put some records out just exactly like you did. And the guy, he's a real good listener, as he's leaving he says its funny the sound stage wasn't quite as good on one side. Which really hurt. Because of who he was. And because I'd never noticed. Soon as he leaves I am in there listening and sure enough, and I know it was NOT like that before, so what....

No. Can't be. But like I keep saying you check, you take nothing for granted. So I remove those LPs and damn, that was it.

Move your chair a couple feet closer and smack dab in the center. And by smack dab I mean precisely ! lol!
What’s the rug made of? If it’s synthetic try replacing it with a similar natural wool rug. Synthetic rugs no matter how plush or comfortable impart a harsh tone. I’ve fallen into this trap a few times

plus the suggestions from millercarbon are good, especially about getting rid of asymmetric surfaces like the stacked LPs. In my room I can hear the sound of an exposed CD case, and it’s not pleasant 🤪
Thanks a ton for the input, everyone.
The lps will be in a record holder soon, waiting for it to be completed. Waiting for 2 inch foam acoustic panels to come in for side walls and front wall. 
I will try moving the chairs slightly closer. As well as making one centered and the other offset.
90 percent of the time I'm a lone ranger anyway.
Thanks again.
You will definitely need to experiment with room treatments.Get a few sheets of the 703 insulation and move them around and even double them up.Upload some pictures to GIK acoustics and take advantage of their free consultation.You aren't obligated to purchase anything.
I'd imagine the rug is synthetic. But it does have a very nice under pad below it. And wall to wall wasnt an option, so I figured it would be better than the full out laminate lol