I moved now Kef sound bad


Hi I'm somewhat new to hifi.

I've moved and it seem that my listening room is now too big. Previously my speakers Kef XQ-5 sound great with good imaging and bass presence. My listening room was 11x14x8, now it is 21x 19 with 17 seeling. I'm using a Nad 90 watt receiver. I guess that I'm not feeding the speakers enought power!

A ny body ahad the same problem. How can I fixe it,??

thanks

David
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I forgot to mention that I leave in a condo so the room mesurement included th kitchen, and dining. The left speaker is 30 inch from the wall, the right is 36 from the counter they are 8 fee appart and 12 inch from the back wall. My listening position is 8 feet in front.

Can you tell me what is the 38% rule?

I don't the SPL of my speakers , how do I check?
I'll buy a new system before going back their.

I've moved the speakers a lot, it help, I put them further from the back wall, the bass seam tighter, but if I'm not seating on the middle of the sofa I hear echo.
thanks for all your imput, but is their a way to compensate for having a speaker 44'' from the side wall and the other from the kitchen cooking island?

It seem that the speaker next to the wall play louder, I've test and it's not the equipment.

Thanks

David
Oups, I forgot to ask the question !

What should I do so that both speakers sound the same with an un-even room like that ?

Thanks,

David