i would say your feeding is fine Phil for your location and getting your birds to home from a race. i know its not always easy for you to get out to the loft ,, yet i would watch them feeding , which seed is getting cleared first ? i am fairly sure it will be the maize ,as Tony has said look to add some to your feed if thats the case . Gerry + would be ok to replace some V/L best all round for the race birds i.m.o. . Bigda has a point about the worm treatment , did you give a secondary dose ? do you give multi-vitamins in any form ? i would also (myself) have treated for canker for a few days at least every 3 to 4 weeks . i am no expert Phil , these are only my opinions , not always easy when we cant see and handle them first hand .