Pumpkin Stout - Feedback?

This is pretty much my first All-Grain recipe. Until now, I have been using strictly tried and true recipes I've found on here with great results, but I could not find a pumpkin stout recipe, so I went off the board a little bit. This is a modified version of CBBaron's Smooth Oatmeal Stout recipe. Any feedback for a novice brewer on this recipe? I am expecting somewhat low efficiency, so I might do just enough to keg. Ideally I have some leftover for a few bottles after filling my cornies. Should I boost it up with a bit of DME? 4.0 is a bit low, but I am crossing my fingers for more than 70% efficiency. Thoughts on that? I think it will be interesting to find a balance between the pumpkin and hops. This is my second pumpkin beer, but I am still waiting to see how the first one turned out. Another issue is that I have never had a commercially produced pumpkin stout, so I am not sure what to expect.

Pumpkin Stout

Batch Size: 5.000 gal
Boil Size: 5.750 gal
Boil Time: 1.000 hr
Efficiency: 70%
OG: 1.036
FG: 1.007
ABV: 4.0%
Bitterness: 30.4 IBUs
Color: 36 SRM

Pale Malt (2 Row) 8lb
Roasted Barley Grain 12oz
Chocolate Malt 12oz
Medium Crystal Malt 12oz
Flaked Oats 1lb

4 lbs baked, spiced pumpkin. (I will supplement the homegrown pumpkin I have left with a small can of puree.)

2oz Willamette (1oz 30 min, 1oz 60 min)

Wyeast "Irish Ale" 1084.

This was also my first adventure into the World of software brewing. I put this together using the Open-Source "Brewtarget" software, so far so good.

Send us your beer to taste on the air ........Cheers!