Your recipe looks like your typical brown ale
I love my ales hoppy so I used different hops with higher AA, but yours sounds good to me.
as far as the maple sugar goes it depends on what you are aiming for. Assuming you want a maple hint I'd throw it in at flame out. Otherwise you can toss it into the secondary for a maple blast. Throwing it in at flame out will also allow the maple sugars to be fermented. Throwing it into the seondary will also cause the sugars to be fermented, but not as much as in primary.