bbb,
I looked at Chrome's entries, the result charts and there is no mention of a shoe change or nasal strip.
I did notice that Chrome ran the first 3 starts of his career with No Lasix or blinkers but with front wraps on.
He ADDED Lasix and blinkers in his 4th career start at Dmr on 7/13 with a win, then he had 2 straight losses, one at Dmr on 9/4 and another loss at SA on 11/1.
I also noticed between his last race on Nov 1 at Santa Anita and the next out where he whistled, he did have 5 workouts. Its fair to say the improvement began during that period between Nov 1 and the Dec 22 race where he crushed the field. Espinoza also rode him the first time following the workouts. I personally think Espinoza has made a huge difference in the way the horse is now being ridden.
Logic suggests the shoes and the strip made a difference because before the shoes and strip were added the horse was not running that well.