Has KG and BO tried other efforts first? What were the results, regardless of time frame. That could simply be an indicator that other soft approaches weren't working. Being dim / dark / NC for 20 months would possibly have the same results.

I have only tried LRT. That was the stage of my sitch when I found DB

TPS
Me: 44 H: 42
M14 T17
S10 D7
10/10 H moves out after death of his father-same month
21/04/12 H is 'DONE'
04/05/12 OW/PA confirmed (rumors from 2010)
July '14 H ends affair
May '15 H moves back home