putting the caramel in caramelization

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a small rye boule

So I baked a small version of my go-to deli rye and it came out looking beautiful.

As always, it was lofty, with a thin shattery crust, & a moist & light interior. It's 45% whole rye, 10% whole spelt, 45% bread flour. About 80% hydration.

But: it's lacking the sweetness that the crust normally has. In fact, it's a tiny bit bitter.

What do you think might be the issue?

Among the possibilities--

--the bags of flour, though almost a year from  their 'sell-by' dates, have been in my closet, open though the tops are rolled up, for maybe a month. I baked the same bread with the same rye & spelt but different bread flour a month ago and the sweetness was present.

--the starter, after having been refreshed, sat in my fridge for a week or 2.

--I used the starter straight from the fridge -- and the water I used was only luke warm. Then I refrigerated the levain for 12 hours until I had time to bake. This made the final dough quite cool, so I gave it extra fermentation time -- about 2 1/2 hours of bulk instead of 2 hours, about 1 1/4 hours of proof instead of an hour.

-- when I did the final shaping, I sprinkled the counter with spelt flour because I was out of rye.

-- I dripped some water on the boule rather than spraying it before it went into the dutch oven.

Does anyone have any thoughts? Thanks!

Rob