Yes, both of those can help. Maltodextrine is an unfermentable that can be added to help with the mouthfeel/body as well. This will boost SG and will not ferment out leaving you with a high FG or you can add it at bottleing/keging.
Secondary #2: Empty
Bottle Conditioning: Oatmeal Stout
Drinking from Keg: Ordinary Bitter, Kolsch
Drinking bottled: Brown Autumn Wee Heavy
Peaches and Cream Weizen
"This is grain, which any fool can eat, but for which the Lord intended a more divine means of consumption... Beer!"
-Robin Hood, Prince of Thieves, Friar Tuck.
Next up: Hefe Weizen