On a broad reach the wind will always feel like it is coming from the quarter otherwise it isn't a broad reach! Right? The higher the windspeed the faster the boat but it will still be on a broad reach with the wind over the quarter.
There is a tide in the affairs of men,
Which, taken at the flood, leads on to fortune;
Omitted, all the voyage of their life
Is bound in shallows and in miseries.
Shakespeare, Julius Caesar IV, iii, 217