I was able to start up my basal experiments again last night, still testing 11 units of Levemir.
I went to bed at 155 at 11:14pm, woke up a few times during the night to check my Dexcom but didn't get any fingerstick readings. This morning at 9:45am, I was 115. There's definitely still a slight downward slope, meaning 11 units still seems to be too much.
While I'm glad it brought my number down to a normal range, the point of basal insulin is to maintain a steady blood sugar level. I want to be able to go to bed at 90 and wake up at 90. That is the goal. Waking up 40 points lower means I still have some tweaking to do. So, I shall test 10 units next and see how that does.