Nice. Thanks for the tips, guys.
I found a great picture of what you are describing here:
http://www.centenaryarchers.gil.com.au/basic1.htm#Pressure%20Button%20Tuning It explains why the arrow should point slightly left for RH shooters, "Adjust the 'Centre-Shot' position of the arrow on the arrow rest by winding the plunger button into or out of the riser.
To do this, nock the arrow on the bow, then looking from the rear of the arrow, align the bowstring with the centre of the top and bottom limbs, then check the alignment of the arrow shaft to the bowstring.
For bows shot with fingers, the correct alignment should be 'Outside Centre-Shot' position.
Only the diameter of the arrow at the point should be to the left of the bowstring.
The reason for this position is to counter-act the slight sideways motion of the bowstring on release from the fingers."