That’s the truth! The reason is when you arch your neck to look at the dots you change your hand position.
Much better to play with a drone or along with simple bass book recording to find yourself. To be honest, the pay is an in the first few positions anyway, so it shouldn’t take long…
I’m not trying to encourage you to spend more cash, but WAZA air headphones work well for that purpose. A little too we’ll if I’m honest as it shows how useless I am!