Lol, it is going to be interesting once Fatimids get broken up.
Also, Iberians are weird indeed. Nothing much happens aside from Christian-Muslim wars and conquests back and forth ('deconquista' as you termed it ), unless player intervenes.
In one of my ERE games, the wars kept going on for two centuries without any change in Iberia. Sometimes the Asturians captured almost all of Iberia when Umayyads got a civil war, only to break themselves while Muslims come in waves and retake everything right up to French border. It went on all the way from 867. Meanwhile as ERE I worked on recapturing Egypt, Syria and other territories of Africa.
When it hit 1100 and the fiasco was still going on, I got fed up and claim-conquered parts of Iberia myself.