Muffled vocals


I have positioned my speakers every way imaginable and I just can't get the vocals the way I want. They're centered, but they seem like they're in the background.  I want them more up front.  I've tried various toeing methods and room treatment but they still seem a little muffled.  My equipment: Lyngdorf TDAI-2200 integrated, Marantz CD6006, Tyler Acoustics D-20, Anti-Cables, Audioquest digital cable.  I know the recording can have a lot to do with it, but Steely Dan's Aja is known for the recording quality and Donald Fagen is in the back.  My terminology no doubt betrays my lack of sophistication when it come to audio, but I know something's not right.  Any suggestions?
cal91
And Elizabeth, I've been using some well-recorded Mozart, Pink Floyd, and Linda's 'Heart Like A Wheel' album as a control pieces to try to get the speakers in the perfect place. (perfect ... sure).
I tried to choose artists that I wouldn't get tired of listening to. I love the sound of Linda's voice; never get tired of it. And it stages well, too.
I have the current placement taped, so I'll shift them a little more.
Oh yeah ... also, when said that Elton John's piano is never center stage; I meant when he performs. So, it really shouldn't be centered between the speakers, I wouldn't think. N'est ce pas?
Teknik:  'Your speakers at 30 from the front and 28 from the sides are to similar"

Good grief - that's right! I need to figure out a way to correct this with my speakers! But this tuning procedure always takes time and experimentation and I've been isolated from the hobby for too long. Thanks for the tip, even though it was for another forum member.
Rick
It took me 4 days to get mine dialed in, Elton John piano is on the left side alot not just center stage.