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My 2c, go deep with the pier if you can.
Sticking 10sqm of concrete 700mm deep will still give you the same movement with hydraulically reactive soil. If you go a lot deeper with the pier the ground/water ratio is a lot more stable further down (its water retention is a lot more stable than on the surface or a little way down), and you have an averaging effect over the length of the concrete pier below ground.
Get a bobcat to drill a hole as deep asyou can go, use some large rio for reinforcing to stop the the concrete pier footing from snapping under uneven hydraulic load and it will be a lot more stable. Putting a large mass of concrete near the surface I believe will have very little difference from what you have now.
Brett
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