"Precourt gaffer", and lashings.

[Brion Toss]

Hello,
I really like the looks of that project, but the length and depth of your query is really on the consultation side of things, if only because it is difficult to answer any of your questions without answering all of them, plus a raft of others.
For example, starting with peak angle: If you peak it any higher, you'll be approaching a Gunter, and in any event the span wire as shown will cause the peak blocks to clash, plus the same span wire is way too wide-based, imposing much more of a compression load than seems advisable, and reducing effective purchase.
Or take point 7, about not going all the way forward with the outhaul because, "it's not going to be a racer." What does that have to do with it? Racers just use lighter, more expensive tools, harder and more obsessively. But if you've been on a beat, then get on a run, you won't want to go to the end of the boom to slack the outhaul. And no, deadeyes would be a poor choice here, as outhauls typically need all the purchase they can get.
I hope you can see that you have a large system here, not a series of questions.
Fair leads,
Brion Toss