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When these cars first came out, it was commonly thought that even 10:1 compression was high compression, and people thought with 12.5:1 that no way this can handle any boost, then people tried it and thought, OK it can handle it but 7psi is the limit, and then they kept testing it and pushing it and its been shown that even 12-13psi is pretty reliable on a stock engine. Many tuners in recent years now have changed their thoughts on needing to lower the CR stating its not really necessary, and often times not recommended.
New tuning methods, the cars ability to monitor so many parameters and give instant feedback, being able to adjust and tune so many parameters, and having both PI and DI, has allowed tuners to safely push these cars closer to the edge, as well as push the edge further out, allowing for safe reliable power with out needing to drop the CR.
400whp on E85 is easy to get with stock CR, I would possibly consider 12:1 for a slight added margin of safety and being able to push the car more in the future if desired. but much lower doesn't seem necessary or worth it on these cars, unless your shooting for some crazy numbers.
Hearing from people who dropped CR stating its worth it or recommended doesn't really say much. I would much prefer hearing from people with built engines and kept stock CR and what their tuner said was the limiting factor for reliable power.
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