Well.. then i got in a hurry and this happened..

[Bluesytone]

It seems that somebody... wasn't paying attention and was attempting one of them two chamber jobs in an area that only one chamber should be placed. boy is my face red...

[sandahlpipe]

Looks like you're drilling after shaping. That's fine, just drill a pilot hole with a brad point bit. Then the spoon bit won't wander so much.

[Bluesytone]

I actually drilled a shallow pilot, however it was the first time with the skin on top of the plateau and i clearly didn't pay attention to the wandering! Do you recommend drilling a pilot the entire depth of the bore? I'm new to spoon bits and with a spade I didn't drill pilots and usually had good success.

[Bluesytone]

I answered my own question by going back on the interwebs and reviewing spoon bit procedures. I should have in fact drilled a pilot down through the chamber to meet the airway.

[sandahlpipe]

I stop with the pilot a little shy of the airway so the wings of the drill don’t gouge the bottom of the chamber. But you want to guide it most of the way down.

[Bluesytone]

Super, thanks for the tip!

[DocAitch]

When I start a chamber in plateau, I create a divot where I want to start with a pointed Dremel bit deep enough to allow the drill to start and not catch or skip on the nubs. I use a regular bit, but still stop a hair short of the draft hole.
DocAitch