I've used the Windscoops on several boats... on a small C26 I had the same problem with Vberth not getting much circulation when the wind dropped.. but some still blowing.
I fabricated a cloth of the same material... an old windschoop... where I fitted it across the hatch opening allowing the middle to sag inward about 8 inches. This redirected the low end breezes forward rather well. It covered about half to 2/3 of the hatch opening. I accidentally discovered this idea when a mosquito screen
I had covering the hatch drooped and forced more air back into the v-berth.
When the breeze kicked up it wasn't needed which was a good thing since it would tend to flap with the breeze coming back on it from the V-berth. For lighter winds it was great.
Sorry don't have that boat
anymore and can't send a photo
. I'm heading back to my boat in BVI
in a few days and if I find the winds dropping I may make another and try to get a photo
to post later.