Sweat spot? Sp. placementt again


I get better sound standing up, rather than sitting, at the listening position. Anyone encountered this? Pls read on before you bash...
The listening position is two feet from the listener's back wall which is damped with wall carpeting.
We pooled resources with my partner (she's from down under: they hear things diffferently there, so she says) reaching an optimum positioning for our Gen Vs, following hints from Redkiwi's ("speaker placement") posts -- thanks everyone!
The room has an asymetrical listener's back wall, with a round fireplace on one corner and a 7ft opening at the other -- 12ft wall in between. The ceiling is 8ft high, room length ~25ft.

We tried listening closer to the speakers -- but, no cigar. Tried a higher chair too! -- ditto.

Any ideas?? Thanks.
gregm
Thanks everyone! The problem in my room was indeed in the 1st reflections on the ceiling and 1st & 2nd reflections on the side wall. We damped the ceiling simply by placing a carpet covering the 1st reflection point for both speakers (it looks nice, too) with a foam between ceiling & carpet as extra protection. Ditto with 2nd reflection points on the side walls, with smaller rugs.
Ofcourse, I have to review speaker placement again; but already, high frequency details / space between instruments, are more palpable.
Thanks again, all!
Gregm - with a girl from downunder, I can't see your problem. Have you tried canting your speaker forward a little (or up at the back)?
Hi Redkiwi, no I haven't -- just tried a higher chair. Will do so ASAP. BTW, don't you mean ..."I *can* see the problem."? She's the one complaining about "can't single out those cellos" or, "where are Hutchens' (INXS) feet on this track -- can see his face, but not the feet...", and drives me into compulsive tweaking.
Thanks!