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Hmmm interesting setup here, I'm curious about a couple things:
Why did you use 1.75" tubing for your manifold? That is definitely hurting your spool times.
Why did you pick two turbos that are so close together? For me a compound setup is about getting a big turbo online faster with a smaller one.
What size A/R is on your S259? Looks like the Bullseye .70, which is much too small to support the flow of an RB+2871R, and I think you're going to run into backpressure problems if you turn the boost up.
What do you have the wastegates set on right now?
Oh and you should definitely switch to the smaller A/R on the 2871R.
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