i recently bought a klipper mate drop weight stringing machine and i strung a few racquets but i seem to keep having the problem...the tension on the racquet is ALOT lower than the tension i set the weight at. i followed the instructions they gave me and added two or three pounds on the last two strings of the mains but i still find it loses a lot of tension once i finished the racquet. is it my fly clamps that may be the problem? the knots? or should i just add a few extra pounds on the weight to compensate for the tension loss?