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hat-man,
I am not an expert, and hopefully the more experienced will chime in, but the AST-II is a little more aggressive than the AST-I but still well within safe conservative values. As you get more taper quicker, for a given fixed length the AST-II should perform better, but running the AST-I longer would allow the item to catch up. (e.g. it may take a 20" AST-I to match a 18" AST-II) You can always go shallower than either "template" but it will take longer to get the same effect.
I will warn you drag reduction gets addicting, and you may regret not doing more initially. It wasn't long after my half shell was finished that I started my full shell.
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