It appears that you have covered everything.
8 books bound? WOW!!

I did not submit any logs, emails etc! only telephone bill, thats it!
ECOs are generally looking for evidence in these areas:
~Parties must be legally married to each other~
~Plan to live together~
~Have met each other~
~Be able to support themselves entirely without recourse to public funds~
~Have adequate accommodation where dependants can live without recourse to public funds~
~No Terrorist risks~
Its probably a random case of screening the person face to face. Not to worry.
Best Wishes