I don't drive.Its all bi-directional with plenty of cross-overs. A couple of times when there's been a power problem or a failed train, I've been through the 'wrong' tunnel heading from Stratford Intl to St Pancras.
Unfortunately I think any complaints about the Olympic timetables are likely to fall on deaf ears at SouthEastern- the "Javelin" service was always about getting as many people on the 7 minute run between the Olympic park and St Pancras....sod the rest of us just trying to get around.
OP- I know its not ideal, but if its possible, what about driving to Ebbsfleet? Probably be home within the hour and heading the opposite way to the crowds.
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I thought you were supposed to be able to alter your tickets? I booked mine last night and chose Non HS1 for the return trip because I was going to come back via central London. Now I've found a way of getting back via Ebbsfleet and Greenhithe and I wanted to change my ticket to a +HS1 one so I could get to Ebbsfleet, but it won't let me make any changes.