Paul, the piece on your site about RPR v Timeform ratings in bumpers is spot on.
Regarding the race itself, a large portion of the field have done their winning by making all on an uncontested lead and dominating their opponents. They're probably experiencing more competition at home than they've seen on the racecourse.
Some of know to our cost that the Champion Bumper is a rough race and you need a horse that can handle himself. For this reason I especially like Moon Racer, who on his Fairyhouse debut (at 50/1, incidentally) met interference but was then brave and willing enough to go through a tight gap between the leaders and get away from them. The form of that race has stood up well, and the race he won at Cheltenham in the autumn also looks strong. Moon Racer made all that day. Winning his two races in contrasting styles shows he is tactically versatile and amenable, which should be a big help in the hurly burly of a big field where the competition for a prominent position early is likely to be fierce.
Paul's horse Bay Of Freedom also had to win a scrap coming into the straight at Galway, and the way he came up the hill there suggests he'll be staying on nicely when others are fading.