Jeff I know you are a highly esteemed PS guru and far be it from me to try and give you advice, even though I suppose I am endeavouring to do just that here, but I noticed in the C2PS videos, that in one section after making a large pano, you then straightened it with some difficulty by using the warp tool. I also make quite a few panos myself and have developed a much quicker and more accurate way of doing this as a result.
Having stitched your layers together etc using the cylindrical option, select the whole image (Ctrl+A), then apply the grid reference lines (Ctrl+,) now select warp as you did before, but then select the 'Custom' warp function, now pick the 'Arc' warp function (or whichever best suits the straightening needs of your image) and type in the number that makes the image straight according to the central grid line and the horizon in the image. The warp function has a default of 50 (for some unknown reason) which makes the arc go mad initially, so you will have to let it make a mess of your image first, but then delete that number and put a much smaller amount in its place such as 10 and experiment from there - you can also put minus numbers in there if you have an image that needs an inverse warp etc.
OK, you may still have to tweak the image around the edges, but I find this method takes a whole lot of the guesswork out of it.
Hope this helps.
Dave Hickey (UK)