When I have the misfortune of using any of the motorway network through the Midlands, the traffic is vile. Just needs a minor shunt and you can sit motionless for an hour... Is this an event that you can't miss, or is turning up late only a minor inconvenience?
Where are you actually headed? Do you mean 'have to be at the Jubilee Line station at CW' at 1100? Or somewhere else on the Isle of Dogs? In which case there might be more time needed. Sorry, I know this isn't what you wanted to hear, but the plan as outlined seems to have some risk of not being achievable in time you've allowed.