Thanks Bill!
The staggering however is independent of the AOA. If you compare figure 4 a & b, you can see that both apply for a hole range of AOA’s but still have a constant stagger angle of 0 and 30 degrees respectively.
I have an other nice insight from that same article. You said that you do not decrease the fin size for the fins individually compared to a single fin. This is very interesting, as the following picture illustrates that the wing span can be reduced more if the wings are further apart. But remember wings closer to each other have a positive effect on the combined stall angle.
So this shows indeed that fins close to each other should have roughly the same size as the single fin. While a twin fin on the rails can reduce the fin size to almost half the size.
However, the further the fins apart, the less the positive effect of the inside fin (~ upper wing) on the stall angle of the outside fin.
The statement that you can use more upright fins also makes sense. Sweep in single fins soften the stall by twisting and therefore reducing the AOA at the tip. And since the Thraikill fin setup softens the stall angle by the fin interaction, less sweep is needed. The more upright shape may result in a looser feeling.
This fin setup makes perfect sense to me. However I’d go for double foiled fins since the inside fin (~ top wing) is responsible for more than half the lift generated.