RE: sight vs rest vs knocks
As gibblet has said your arrow should be even with the berger button , or rest screw , as far as perpendicular , most have their nock 1/8th to 1/4 of an inch high . Some have found their particular setups with the WB rest like a perpindicular nock , In my experiance this has been with dual and hybred camed bows . Most single cam bows like a slightly high nock point 1/8 to 1/4 inch . This is hardly noticable by the eye , if you arrow looks like its pointing down Id say you have a nocking point problem , which is easy to fix , just move it down some . The rest should be adjusted so the arrow is even with the screws that hold it .