The AFM permits climb with both 900 and 1050Np. It all depends on which type of profile you're using. There are power charts for both profiles - so why contact Bombardier when you can simply refer to the AFM and ODM?
We have found that there is neglible difference in the trip fuel - what you burn in climb you save as you get to TOC quicker.
As adverse bump said, we used to use 1050 to about 8000' (ISA+15 average) then reduce to 900. Another operator in the area used it to 2500' then came back to 900. It all depends on the company's SOPs - which are presumably based on the AFM/ODM. If you're not happy with the company profile, why not get the AFM and ODM and have a look at the figures - you may be right.
But until you can get the company to change them, don't experiment! - Follow your SOPs!!!