well the common sense thing to look at is, if you inject 1 ml in your pecs(i'm hoping they are of decent size!) then what fascia expansion do u expect? very little, right? so yeah if you inject sufficient volume often enough it will work well ...
anyway, i personally used to prefer pec injects because its easy to control them... but god damn every time i shot tren in my pecs the tren cough was unbearable...