The PSE Surge is a single cam bow. That means the metal thingy up on top is the idler wheel, and the idler wheel is perfectly ROUND. You have ONE super duper longer bowstring, and you have a buss cable. So, on a single cam, you adjust VERTICAL nock travel, by SQUEEZING the bow in a bow press, and you then, have to figure out if you need to SHORTEN the buss cable (add twists to the bottom end loop) or you have to figure out if you need to LENGTHEN the buss cable (remove twists from the bottom end loop). BUT, you heard a single cam has NO timing, cuz there is only ONE cam. FINE, call it a SINGLE CAM has a particular starting rotation position for the metal thingy on the bottom axle (cam). The starting rotation position MATTERS on a single cam bow. You change the starting rotation position, with the twisted length of the buss cable. Make the buss cable longer, and the cam rotates one direction. Make the buss cable shorter, and the cam rotates another direction (starting rotation position).
So, on my single cam bow (Mathews Apex 7), I have to mess with the buss cable twisted length, AND I had to make ONE limb bolt a full turn LESS than the other limb bolt, for best results. If the bareshaft (arrow with no vanes) is flying NOCK higher than the pointy end, remove 1/2 turn from the UPPER limb bolt. This will flatten out the bareshaft arrow flight. If the bareshaft is flying still NOCK little bit higher than the pointy end of the arrow, remove 1/4 turn from the upper limb bolt and mess with your buss cable (add twists or remove twists from the bottom end loop of the buss cable). So, if you have a HIGH paper tear...a really really TALL paper tear, where the nock end is ripping the paper HIGH...use the limb bolts to get the HIGH paper tear into a MEDIUM high paper tear. Work the limb bolt (weaken upper limb bolt 1/2 turn or maybe 3/4 turn) and get the MEDIUM high paper tear into a small high paper tear. Now, work the buss cable bottom end loop (add or remove twists) to get your bullet hole.