Look, you also have to remember that a straight is, on average, at least twice as long as a DE. That is a lot more surface area trying to move through stubble. A straight will always feel like it is pulling more compared to a DE for that reason, but as Alan and others have said there are other reasons too. The trick is to recognise the differences between the types of pulling, and deal with the type you can control with technique. I suppose you would call the first kind (due to larger surface area) "resistance" rather than pulling...something to get used to rather than overcome. Although, you can overcome it by using only subsets of the blade like the toe or heel, particularly for certain areas of the face.
James.