That is cool! Nice work.
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Here the white line would be the top edge of the boattail. The straight one is about 13*. I know the curved one breaks 15*. It's not the final version.
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It's OK to exceed even 15 degrees -
provided you have clean, attached flow through the full curve. If I recall, you can even break 20 degrees in perfect circumstances.
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If the lip is necessary to maintain attached flow on the steep rear window, will I need another lip at the very end to maintain flow on the similarly sloped boattail? Maybe I'll just have to tuft test it to find out.
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I'll say no. A (large) downstream lip is a band-aid for up-stream problems (or it may just be "styling"). If you have good, attached flow at the end of the car right now, you should be able to extend it, following the curve, and retain attachment to your new "end", wherever you decide to chop it.