You are headed down the correct path.
Keep in mind (unless you are doing a tutorial with perfect footage) that there are very few instances out there where you are going to cick on a color, and immediately pull a perfect key. Masking is going to be needed in many cases. Hopefully, you can pull a good enough key that your mask doesn’t need to be absolutely tight to the subject, but can have some breathing space.
Obviously you need to play with your ranges. turn your different settings on and off, and adjust each one indivdually. it just takes a lot of tweaking, especially if you are working with highly compressed footage.
As for the masks, perhaps you should think about working with each mask in a different node, and combine them at the end. Play with your layer nodes and see what you can come up with. Sometimes trying to do everything in 1 node is more trouble than its worth.
my 2 cents.
Glenn