How much have you experimented with placement? Generally, the more you tip the speaker backwards so that the drivers are aimed upward, the higher the apparent soundstage. The amount of toe-in can also affect the height of the stage as well as the sense of the sound being bound in the speaker vs. floating free. The further one can get the speaker from all surfaces (side and back walls particularly, big hard pieces of furniture, tv set, etc.) the better the imaging.
Do some experimenting. I would start with tilting the speaker back a bit.
Do some experimenting. I would start with tilting the speaker back a bit.