Oatmeal Cream Stout

I brewed this oatmeal cream stout last week and transferred it to secondary today. I did the taste test and it was strange. First I got this nice sweet taste then like a firecracker going off the roasted flavor hit! For those who have brewed an Oatmeal Cream Stout -- is this normal? I am not worrying, just curious, really. It was actually quite tasty for such a young beer and I know it will take a bit of time to mellow out. Anyway, would appreciate anyone's input when they made something similar.

3.00 lb Light Dry Extract (8.0 SRM) Dry Extract 28.9 %
4.50 lb Pale Malt (2 Row) US (2.0 SRM) Grain 43.3 %
0.50 lb Caramel/Crystal Malt - 40L (40.0 SRM) Grain 4.8 %
0.50 lb Caramel/Crystal Malt - 60L (60.0 SRM) Grain 4.8 %
0.50 lb Chocolate Malt (350.0 SRM) Grain 4.8 %
0.38 lb Oats, Flaked (1.0 SRM) Grain 3.6 %
0.25 lb Caramel/Crystal Malt -120L (120.0 SRM) Grain 2.4 %
0.25 lb Roasted Barley (300.0 SRM) Grain 2.4 %
0.19 lb Cara-Pils/Dextrine (2.0 SRM) Grain 1.8 %
1.00 oz Pearle [7.80%] (60 min) Hops 13.6 IBU
1.00 oz Goldings, East Kent [4.50%] (60 min) Hops 7.8 IBU
1.00 oz Fuggles [4.50%] (30 min) Hops 6.0 IBU
0.32 lb Milk Sugar (Lactose) (0.0 SRM) Sugar 3.1 % (added at end of boil).

One thing is for sure, I think I should have upped the oatmeal in this recipe! But, that's ok, I guess I'll just have to brew another one soon!