Hopefully this graph helps further demonstrate the way SH% + SV% fluctuate throughout the season. X-axis is GP, Y-axis is PDO (aka even-strength SV% + SH% added together). Above 100 means high SH% + SV%, below the opposite:
Take a look at how the Leafs' line goes up, down, up, down up, up, down, down, down.
Which is why it's not really worth getting bent out of shape over not scoring for a few games, or the goalies being poor for a few games. It swings back and forth and over the course of a season typically settles in around 100 average.
I think that graph really helps show how a team's fortunes can sink or swim based on whether their PDO is up or down.