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I think the rule of thumb for use of body putty is, "use sparingly." The larger volume of body putty present, the larger amount of shrinkage. So the trick to minimizing shrinkage is simply to minimize the amount of body putty used as much as possible. That's why for really large gaps, body putty should not be used alone. Rather, one should cut some styrene to roughly fit the gap to be filled, glue it in, then fill the remaining small cracks with body putty, let cure, then sand smooth. That's the technique I use, and I have never had a problem with shrinkage.
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