My correction factor is very different late evening compared to earlier in the day. Late evening 1 unit drops me 6 or 7mmol, and I’ve had Type 1 for almost 30 years.
So, firstly I’d have done a smaller correction, and secondly, I’d have been hesitant about correcting late at night anyway. I’m presuming you’re very recently diagnosed, so in your situation I’d probably have left it, possibly checked in the night (to make sure I hadn’t shot up to 20 or whatever) and then corrected in the morning if necessary. When I was newly diagnosed, my remaining beta cells would have lowered that blood sugar a bit overnight anyway.
You don’t need to try to be good, more you need to be safe. If that happens again, leave the 11mmol, don’t correct and see what happens overnight. If you do go higher overnight, next time you’re in a similar circumstance, take a half unit correction not a whole unit.