what is right to follow

hello i have a problem i made an sight right device using a a whit paper marking with straight line in the centre and fold it to center i test the video of steve davis https://www.youtube.com/watch?v=JNLGgfrNavg and when i did that i see the line jointed standing behing the shot line belly and nose directly to the shot and i figure out that my left eye is telling or see the line straight the ling not disjoiited but when i move my head fraction to the left to test the right eye the lin disjointed.honestly i dont know what to do because i am sure i am right eye player i made a test of it and prove im a right eye dominant my question is when i get down to the shot my cue stick is at the left of my chin or near inside my left eye when i shot but im a right eye please give me some advice...and what are the best to determine the best head position im always strugle of this :(

what is right to follow