Robert, I have not raced YB's at all, sometimes not even training them, just allowing them freedom around the loft. I don't 'race' well at any time, I'm sure you could manage better results in your sleep, but my returns are usually quite good. My reasons for not racing or training them as YB's are largely down to you and your ilk. I have listened to what you have said regarding peregrines. As to soda crystals, they were an old fashioned remedy for 'going light', drying out the gut and killing the worm which caused it. How they would remedy YBS, I do not know.