like what everyone else says: you sound highly capable and it could just be bad luck with committee members. with that being said, i think your shortcoming may have been in the proposal because your accomplishments sound super good! i have a decent amount of insight into the proposal review process (how to write one, participated in a review panel, how ranking works, etc) and I also read 3 successful proposals (2 nserc, 1 nsf) to give me a flavor of what to expect. i probably put the most effort into the proposal out of the whole application (although I did get 2 good journal pubs in undergrad- 2nd and 3rd author). i got ranked 5/6 for the research potential and got a pgsd (i'm a 1st year at a US school). it's unfortunate that you can't apply for this award again but writing a good proposal is going to be a skill you need to carry forth anyways. if you need any help with this, i'd be happy to read yours and give u feedback for the future!