Geologic:
Yes, i built a few versions using this chip, and the LM3410 is capable of going as far as 1A or even a bit higher under specific conditions, for example at a Vf of ~4.5V. But this is very close to it's limits and there are some variations from one chip to another, where they'll start acting slightly differently. However i am guessing your LED has a lower Vf than 4.5V at 1A, does it not? It should work if you did everything right, thermal design is important too as the driver will get quite hot at this point.
What was your supply voltage when trying for 1A?
Which model of the 3410 did you use?
I used 4.7-6.8uH inductors of the model specified in the datasheet.
Otherwise i suggest you drop me a PM or write to one of my two emails, i'm currently monitoring all three regularly..