Actually, As far as I can tell, you almost never follow any good advice. The better the advice the more likely you are to do the opposite. Did you even read the message you are responding to and the file that Pascal sent?
You have a real knack for making things tangent when its a bad idea to do so and not making things tangent when it would be good technique to do so.
It is a bad idea to make the rail curves tangent to the profile curves when making Sweep surfaces.
You should try to avoid making surfaces that have adjacent edges that are tangent. They will cause problems. Rhino really should identify these as bad objects.
If you want good quality surfaces using sweep it is best to have the profiles perpendicular to the rails.
That is the primary reason the technique Pascal is showing you is far superior to your technique.