What if the stat cap on reroll values were limited for each item quality like 3,5,8,10 for green, blue, orange, and red (using +racial power as an example).
That way a reroll of an orange would require further material investment (infusion) to bring it up to the 10% max. That would give some utility to red items since a property reroll would always be maxed.
It makes reds more convienent, but admittedly I rarely have to reroll then after initial setup.