It's pretty clear. The visitors (your guys) had a better outside defence than the home team did, so would expect to stop more more points being scored from the outside. This is reflected in the match-up ratings (Visiting PG expects +27pts/10 shots, visiting SG expects +28pts/100 shots).
The home team probably would have done better had they not used Full Court Press, which hurts defence and stamina. 34 steals is impressive, but they coudn't stop your guys getting open.