American Maple Nut Brown

Here is a partial mash Recipe for a Maple nut brown Ale that I'm playing with...

Maple Nut Brown Ale

Size: 5.0 gal
Efficiency: 75.0%
Attenuation: 75.0%

Original Gravity: 1.058
Terminal Gravity: 1.015
Color: 21.71 (18.0 - 35.0)
Alcohol: 5.72% (4.3% - 6.2%)
Bitterness: 30.8 (20.0 - 40.0)

Ingredients:
2.0 lb Amber Dry
5.0 lb 2-Row Brewers Malt
0.5 lb 2-Row Caramel Malt 10L
0.5 lb Oats Flaked
.5 lb American Victory
0.5 lb Chocolate Malt
12.5 oz Maple Syrup
1.0 oz East Kent Goldings (5.0%) - added first wort, boiled 60 min
1.0 oz Fuggle (4.8%) - added during boil, boiled 15 min
1.0 oz Fuggle (4.8%) - added during boil, boiled 5.0 min
1.0 ea WYeast 1272 American Ale II

Planning on Priming with Maple Syrup... Heard somewhere that 1.5 cups of 100% maple syrup would work.

First any comments on the ingredients? What are the thoughts about amount of Maple syrup to prime with?