I actually create those segments in the workspace area and mostly do not make those segments public (I mostly use those for ad-hoc analysis).As long as I just use those segments in the workspace area, and open the segment builder the "save as" option is not displayed.The only possibility to copy/adj...

Nice. Your scope is visitor, which is pretty extensive by looking at a sales/checkout funnel.Have you tried/checked the numbers by setting the scope to visit or even hit (which would we the most restrictive funnel).