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You still have some air in the system.
Since you bled them on an uneven surface, and didn't use a pressure bleeder, it would have been very easy for some air to remain trapped in the system.
Also, if you have PSM, Porsche states that a PST2 or PIWIS tester must be used to open up the hydraulic valves in the ABS unit to remove any air trapped in there. Since I don't have PSM, I cannot say how absolutely necessary this is, but both the Porsche Factory manual and the Bentley direct you to do this.
When bleeding using the pedal pumping method, it is possible to blow the master cylinder, unusual, but it can happen. If the pedal doesn't drop to the floor, yours is still functioning.
A spongy pedal almost always indicates air in the system. When flushing the brakes on my Boxster (pressure bleeder, level, on stands), I found it was necessary to pump at least 2 liters of fluid through the system to remove all the air and restore the pedal feel.
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