I am anal about taking readings. When you try to replicate a brew you have done, have good notes about what you did, and having gravity reading, batch measurements, exact timing, exact temps that you used, etc. Are the key to replicating the same taste.
It may seem like you don't need those readings, and you can make a good batch of beer without them, no worries there. I tend to want more data than I need, then not have enough. So you take an extra 30 seconds, and grab a quick reading, you may not need it, but in 6 months, you want to make this beer again, that reading is nice. Or, if you want to know when to rack it, that reading is nice.
As to your question, at 11 day's I would probably rack it, if you have a good amount of trub, and the activity has really slowed.