I do pretty much as you do, but may be a little more restrictive of my tippet sizes base on the size of the fly. I generally will not use smaller than 4x on a size 10 or larger fly, 5x on 14 or larger. I find that I get too many tangles when I use a light tippet on larger flies. I also will not go larger than 2x on a size 10 or 3x on a size 14 since I think too large a tippet will affect the action of the flies. I guess that only gives me about 2-3x leeway, depending on water conditions.
Ted