The what you say is true about the NT-games you posted. I took a look on you first division teams last cup games. Most of them winning by a nice margin and partialy because of nice defens (stallions excluded since not winning by big numbers).
In the games below the defensivly superior team commited less fouls.
(15069697)(15069303)(15069261)(15069469)(15069501)(15069516)(15069584)(15069592)(15069669)(15069746)In the games below there was quite even foul distribution (one or the other team commiting up to 2 fouls more or less then the other team)
(15069376) quite equal
(15069387)(15069473)(15069547)(15069590)In zero games did the defensivly superior team commit 3 fouls more then the other team.
I went through the matches quite quick so i might have missed something. But i think there seems to be just as easy to find games that sugests that good defenders foul less...