Sourdough loaf: attempt 2

This one was all white flour (unbleached). Definitely more lift, but still a little gummy in texture. Perhaps I'm underbaking or cutting into while it's still too hot. Good, mild sourdough flavor. Nice crust, though not crunchy like the last one but chewy. I tried cracking the oven door at the end (which is supposed to make it crunchier) but I have a feeling it did the opposite since I didn't crack the oven door last time and it was nice and crunchy.