Since the SA stands are mostly to provide stabilization and reduce vibration through mass, I think the Isoacoustics footers will add significant additional improvement, both on carpet (with the spikes) and on wood (without) as they add the benefit decoupling the speakers from the floor. There are more expensive isolation footers in the market but the Gaias get you really far.
In full disclosure I am an Isoacoustics dealer, but I have used them on all my components and speakers for many years before I became a dealer. I have also owned the LFT-8B on Sound Anchor stands, though I owned them before I discovered Isoacoustics. I have also used Isoacoustics on Magnepans and Quad ESLs with great results.