Philip,
How do you recommend leveling the Giya's?
Personally I don't need the spikes under the G1, we listened with and without the spikes and could not hear a difference, due to the reaction canceling woofers bolted together. But if you want to change the listening height, you can set the he rear spikes about ?" higher than the front spikes, that will bring the image down.
We all have different torsos so adjust to taste.
Happy listening