Andyyy, what type of racing is it that you look to do well with? In sprints, the ETS can easily be the difference between 1st and 5th. Is it worth risking upsetting them so near to racing? Might put them off for a short time, but you should know your own pigeons and whether they will overcome the change quickly or not. You trap to open door into a trapping corridor. How do they reach their sections? Could the ETS go there, thus their system is not changing? Could you sort your ETS trapping system at section entrance, but continue to use your T3 in the trapping corridor, if need be?