another thought - if you look at the roofline on a cayman, boxster hardtop, etc., it rises as it leaves the windscreen, then starts to drop once past the roll bar (presumably to provide headroom). by angling the targa hoop forwards as you have, it is now at a much higher point in the roofline than it would be if angled backwards, and is actually higher than the windscreen as currently designed - gonna grab a lot of air.
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