Brewing a big style stout

Today I spent just about all day in the kitchen trying to brew a huge stout. It started with a john bull stout kit with some barley for a nice head, oats to make it smooth, crystal malt for added body, fuggle, cascade, willamette hops. Was a very big brew. I think I should have added less oats and more crystal malt but we will see when its finished. When I finally got all the wort in and the must done, the colour was opaque black. I didn't use an Irish yeast like normal I went for the Scottish yeast since it worked well with my barley wine.
The must O.G was 1.025, seems a bit light?