As someone in the same position also considering a switch to dutasteride, I have the same question about your regimen with dutasteride. I've taken finasteride 1mg ED since the beginning of January 2015 and I don't think it's strong enough. My reasoning is that while my crown is fine, my hairline has receded a noticeable amount, especially since I started using minoxidil 5% on my temples in mid-March. I don't have pics on this computer, but based on my pics I've concluded that minoxidil has really thinned out my temples without any noticeable regrowth.
However, I'm somewhat torn because it could be more that the minoxidil caused shedding and hasn't been effective (yet), or it could be that male pattern baldness has become more aggressive. In any case, under bright light with my hair pulled back I can really tell the bare spots on my temples have widened.