Cause of large variations in ASD symptoms.

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I notice their seems to be such a large variation people with ASD experience.

Some with ASD seem to have sensory issues, while others seem to have little to no sensory issues. Some with ASD engage in frequent stimming, while some engage in little to no stimming. Some with ASD seem to have speech delays, while others do not. Some with ASD seem to don't deal well with change, while others seem to do fine. Some with ASD seem to have issue with executive function, while others seem to have no such issues.

If ASD is a single condition, why such the wide variations.

Probably because there are a lot of genes involved, and a lot of interaction between them.

I'm guessing it's either genes or;
The trunk connections between the front and the back of the brain seem to be smaller
or to put it a better way the normal, evolved and tested connection from the front to the back (and vise versa)
is smaller. But the brain adapts and lays down new connections as neaded. These new
connections take a more random path possibly increasing or decreasing ability and in extreamly
rare cases stumbling onto a savant ability.

I'd really love to see the inteligence profiles for a large family of aspies to see if the profile is the same
or very different.

There's your problem. Who says that ASD is a single condition? It is a spectrum of symptoms with many possible causes ("polygenic"). In fact, psychological conditions are often quite difficult to define, which is why the DSM keeps changing its mind. People present with all kinds of combinations of symptoms. There is no physical test that identifies them or distinguishes one condition from another. It is very common for people to have multiple symptoms that overlap other conditions - eg ADHD, OCD, Tourette's, anxiety disorders, mood disorders, etc.