Surely its a music thread.And the problem with Generation is they are mass produced with minimal quality control.This means thet sometime the mouthpeces are absolute CRAP.If you get one that works with at least one note in the third octave,stick to it.
I personally us Tony Dixons which I think are very good value for money,and also have a set of Chieftans,which are a lot louder and easier to mic up,and are not quite as pricey as the Overtons,though
they are definately NOT cheap.
Page of Cups,a cheap way to mark the holes might be plastic cable ties,which are probably cheaper , easier to find,and simple to fix,and would not 'get in the way'of your playing.