Sunny 16/ND Filters/Fstop/Strobe settings

I have been reading about this technique and looking at pictures, the math is killing me and I need some people to proof my understanding of this.

So outdoors, bright sun, your camera meters the scene at f/16 SS 100 ISO 100. My max flash sync speed on my camera 200, so f/11 SS 200 ISO 100 is the same metering.

I decide I want to take a portrait at f/2.8 with the background 2 stops lower than the subject.

So f/22 is 2 stops above what the meter reads f/11.

1 ND gets me to f/16.
2 ND gets me to f/11.
3 ND gets me to f/8.
4 ND gets me to f/5.6.
5 ND gets me to f/4.
6 ND gets me to f/2.8.

So to shoot this portrait at f/2.8 I will need a 6 ND filter.

I will have to set my strobe to meter at f/22 on the subject?

Is this correct or have I made some fundamental misunderstanding?

That's about it.

If you position your model just right in the scene, you can get a 1/400 shutter speed thus gaining you another f-stop. If your camera has ISO 50, there's another f-stop.

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