Plenum sizing for a custom intake manifold

Looking for some input on plenum sizing for a custom intake manifold build on a 3.0L twin turbo V6.

Target: 700whp on E85, dual Garrett G25-550 turbos, dual 60mm Bosch DBW throttle bodies, Haltech Nexus R3 management. The manifold is a fully custom billet aluminum design.

The layout per bank is: throttle body → pre-cooler plenum → W2A core → post-cooler plenum → runners. Current volumes are approximately 2.14L pre-cooler and 0.78L post-cooler per bank, for roughly 2.5L total per bank and 5L total system volume across both banks.

Primary build goal is street drivability and throttle response - not just peak power. This car will be driven hard on backroads, so transient response matters more than outright dyno numbers.

Question:

Is 5L total plenum volume (2.5L per bank) well-matched to a 3.0L boosted engine for this application, or would you trim it further to sharpen transient response? And how much real world drivability difference does this even make especially with short intercooler piping and dual 60MM DBW....if I added 1/2 liter and drove it back to back could I tell in the real world?

From my research this is the kind of rough guidelines I have found:

• Street / balanced drivability : 1.5–1.8x — Crisp response with enough buffer to handle boost without drama.
• Track / high-boost performance: 1.8–2.2x — My go-to for most custom turbo V6/inline-6 builds; adds power without killing fun factor.
• Max power race: 2–2.5x — If you're chasing every last hp and don't mind a bit of lag.
• Too small (2.5–3x): Gains flatten out; response suffers more than power improves (per dyno comparisons).

Thanks!

Appreciate any input from people who have mapped plenum volumes on boosted builds with integrated W2A.