I contend that you would only start experiencing a slight descent
rate at an airspeed no different than prior to the forward c.g.
shift...Your thoughts?

Very good!

How about this: since the increased drag leads to an increased
descent rate with the power off, you will have to increase your angle
of attack at a greater rate during your flare in order to maintain a
constant altitude above the runway. Since you're increasing your AOA
more rapidly, your airspeed will be falling more rapidly.