How can I raise the height of the sound stage

I built stands for my 988's by going to a timber frame housing company and getting roughly 5' of solid 12"x12" fir used for posts in timber home construction. The cost was around $200, and they cut it into two 26" lengths, one for each speaker. It definitely brings the soundstage off the ground, with only minor loss of some of the bass. I think it's worth it. I might go with 10"x10" though, as long as the spikes from the 988 would fit on it.

Let me know if you would like more information.