It would appear that early morning at LCY is quite.
If you are able to get seats on the 7.05 am then I would go for that one.
Whilst the 11am is missing the morning peak, if something happens then people from this flight will be waiting for a decision, fly or not to fly and so the airport will be challenging.
I agree with another poster try Saturday and the airport will be quieter and hopefully more relaxed as well.