Dave, I haven't added ballast yet, but I will. When I add the ballast I'll use the two- sided tape also. I'll use 1" tape butted up against the ties on each side of the track, or maybe a little bit under the ties, and attach the ballast to the tape and let the ballast sit freely between the rails and ties. This makes it easy to pick up ballast to reuse if you make changes to the track plan.
The tape has really held the track stable for years on my layout and continues to do so. I learned this method from Kirk Mitchell of Just Trains back when I bought my Atlas track from him. I was initially skeptical, but it has worked very well for me.
When laying the track at first I'll use one screw at the apex of a curve to keep it in place where I want it, then use the two-sided tape everywhere else.
