Great clarification Mike.
To the OP - good call on the 15, it remains my favorite tool and the one I reach for most often myself and as you can imagine we have quite the selection here at RUPES USA
To the washer mod, its something that does increase pad rotation by over-riding the built in anti-spin shroud. Is it recommended by us? No. Is it going to cause us to disown you? Nope. Kevin Brown did a lot of research and does great things for the industry, his washer mod is an option, plain and simple, that can or cannot be done to the end users preference.
I will say that with the 15 the pad stall "issue" is far less pronounced, its the larger stroke and pad size that causes the 21 to occasionally stall rotation in deeper curves.
With the release of the Mark II tools last month its virtually a non issue, but I would ultimately recommend you explore the options yourself. Try the tool without any changes - I suspect with a 15 you won't see the need for a washer mod, but if you do its a fast/easy change to make.
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