HFS-6 and direct port on a big turbo BMW 6 cylinder?

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Hello all - I am going to be purchasing an HFS-6 soon. I have a BMW 2.8L 24v (bored .025 over) with a 76mm turbo and a fully custom exhaust and intake manifold. The car has a 28x23x4" front mount intercooler, 3" charge piping with adel wiggins fasteners, a CNC and flowed intake manifold, T4 PT76GTS turbo, and Injector Dynamics 1000cc fuel injectors running a DTA S80 Pro ECU (UK guys may recognize that).

I am interested in running direct port methanol/water injection ONLY if it is beneficial. I have a few concerns:

1) Will the system pulse properly given the additional volume a "distribution manifold"? I would think the volume of fluid would be increased and since there's no mechanical injection valve at each runner, wouldn't it dampen the pulses and ultimately change the systems effectiveness?

2) Would the engine draw the methanol/water from the "distribution manifold" after injection, under engine braking (vacuum) and ultimately hinder the system from shutting off immediately during decel?

3) What size injector nozzles would be ideal? I guess my long term power goal for this car is 850+ rwhp, running the turbo over 30 - 35 psi. But, I don't want nozzles so large that I can't adequately control the methanol system at say 20 - 25 psi on the street.

Thanks guys - any help is appreciated!

Here is a photo of the intake manifold and the car:





Thanks again