I have not used all of the yeasts you listed, but here are my 2 cents worth based on my limited experience (now only worth 1.5 cents due to inflation):
WLP029: better suited for drier, crisper, hop-forward styles
WLP051: too fruity for a helles (or any other lager IMHO)
WLP800...
Peanut butter extract, vanilla extract, and unfermentable sugar (lactose) ... not gonna go overboard, just a hint of each.
The pillow is my Wilser bag, under my kettle lid, which I'm using to press the goodness out of the wet grain. :)