You are still claiming that there will be definite "signs" of things leading up to Christ's return. However, Christ clearly teaches that His return will catch people off guard, as in the days of Noah.
And why is that a problem? ... Birthpangs are a sign of an impending birth, you dont know the exactly time of the birth ... but you know its coming.
Just because there are signs prior to His second coming doesnt mean you can compute the "hour and the day" when he will actually return.