Doughy inside...

I made this today and it looked great coming out of the oven but was too doughy inside. I tried to put it back in the oven for a while but those efforts were in vain. I followed the recipe except that i added crushed walnuts and used chopped dates (the only dried fruit i had) instead of sultans. I also added cardamon, cinnamon and clove. Love the flavor, but wish it would have cooked through. I am guessing i need to try for lower temps and more time in my oven? The volume didn't increase much at all with either of my proofs... but seemed to rise OK in the oven. Perhaps it was the cinnamon?