My wife uses the Terry Butterfly on her road bike and the tandem. We cannot offer any help with Brooks but suggest the following. Is the problem chafing or pressure on the sit bones? If it is chafing, then the shorts and / or the chamois butter or lack there of may be the problem. We use Assos and bag balm for chamois lubricant. Saddle comfort means a saddle that is the right width for your sit bones and is adjusted properly (tilt and height) and shorts that have a good chamois that stays in place and is well lubricated.
Also, most LBSs allow you to buy a saddle and for some period of time swap it out for others. I know of cyclists that have swapped out 6 saddles before they found one they liked. Good luck.
