Bia botal, I can understand your frustration at falling at the first fence. It would have been a great start that first win. but a union is not a white knight that rides over the hill, kills the dragon and then rides off into the sunset.
A union is a living breathing thing, and its executive take direction from the membership about which battles to fight and how to fight them, they also get a feeling for the level of resolve and this they take into the board room/court house. Because you have a union does not mean you will win for ever more, you win, you lose and the exec. who you elect make judgment calls based on their own interpretation of the currant industrial climate but their primary concern is jobs then pay. They will squeeze (with your help) the company to ensure you do not lose one or too much of the other but no union should try to damage the company it works within. Don't give up after one little set back, M'OL is scared of unions (read any of the literature on him)