The only two pairs other than GBP/JPY that I've used the the ADR-based target calculations are the USD/CAD and GBP/JPY. In both cases I've found that the ADR/4 or ADR/5 (if ADR for the last few days has been below the longer term ADR), have both worked out well.
I do use a buffer too, and that part is kind of arbitrary since that has to be based upon past experience. I got the 9 pip buffer I use on USD/CAD from Metalhawk, a trader on Nick's blog and it's definitely necessary there because of all of the times price will just peek above a scalp line and then reverse. I use a 6 pip buffer on GBP/JPY and I'm doing the same on GBP/USD. This buffer is in addition to accounting for the spread. I'm on Oanda which charts the average of bid and ask values, so I add half of the spread into my buffer for both long and short orders. With that said, I'm looking at going forward with a S&R zone approach to breakout trades so that will factor into a buffer between a scalp line and where I'll set any pending orders.
Cody
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