Maybe you should check your OM/B.
Vol. III says about AFS Systems:
"The autothrottle system also aids in windshear recovery by providing quick response to any increase or decrease in speed. The commanded levels of power may be beyond what the average pilot considers necessary but, in fact, are required by the situation."
I would interpret this suitable also for your question of flying the upspeed - if A/T is engaged no additional margin is necessary.
In addition our SOP/Vol. I says that no additional wind correction shall be applied when flying an approach with A/T engaged. So again i would say thats suitable.
But - isn't it somehow too sophisticated? Upspeed changes with grossweight, the heavier the upper your speed... differs during normal takeoff weight ranges about 10 knots, so who actually knows exactly what the upspeed is? 208 or 210? so...... well..... errrrm
just my 2 cents.