Have not raced my ybs in 5 years but like you mick think it's time to change ,with all the fast racing this year my inexperienced yearlings are getting blown over and not having the experience to correct themselves . Don't do the darkness here but mine are second round ybs just up and ranging in the last week, I feed heavy until they have walked around garden and know how to get back in loft with confidence if spooked then start to change feeding to Gerry + and depurative and trapping mix and away they go flying for fun also keep a pair old birds in with them to hold close to home until confidence builds then remove them . Good luck today mick .