In the early days I used DR Harvey Karps 5S method (erm, swaddle, side, swing, suck, shush) it's similar to Tracy's 4S but the side and swing (it's like a tiny rocking) was like a magic wand had been waved. I'd seen it work miracles on a whole line of babies on a TV prog years and ears before I had DS but the memory had stayed with me as it was so amazing! Anyway, I know a few other long term BWers have also used it, it fits very well with BW.
There are on-line videos of the technique in action if you wanted to give it a try.
FWIW I did pat in the early days but I realised my DS was not really into patting and later discovered silent reflux so the patting maybe aggrivated that. The rocking which at times I would say was LOTS of rocking was easy to reduce and reduce like patting is and I was able to move him to his own bed and use a firm hand to slightly rock there and wean it with reduction and on-off. He was self settling early with me using this method of rocking rather than patting. The film I saw of karp showed the rocking, it's hard to describe quite tiny in movement but almost "vigorous" or like a vibration or like the motion of a car. (karp uses very big swings if LO is not comforted by the very small 'swing' but I didn't need that...the method uses as little as is needed for LO to calm, same as BW).
Just a thought.