What type of mash tun are you using?
I ask because you will probably want to use rice hulls with oats. They are literally the gummiest thing I have ever put in beer.
Personally I would increase the oats to at least 1#, I generally use 1.5# per 5 gal batch to really get that creamy smoothness. Also make sure that they are instant or flaked oats.
What mash temp were you thinking? I mash at 154 for 60 on mine, which is a bit on the dry side, and yours will be even more dry than mine with 0 caramel malts in there.
The power to tax, once conceded, has no limits; it contains until it destroys. I was not joking when I told them to dig into their own pouches. It may not be possible to do away with government sometimes I think that government is an inescapable disease of human beings. But it may be possible to keep it small and starved and inoffensive and can you think of a better way than by requiring the governors themselves to pay the costs of their antisocial hobby?
R. A. Heinlein