Which TT saddle

I'm in need of a decent TT saddle as I'm suffering with the road saddle. Like many, I have a couple of hard internal cysts that get uncomfortable after a while, but too small to bother having the scrotum sliced open to remove. I see that ISM get mentioned a lot as a favoured saddle for perineal relief, but also that the fore rails can sag after a while. Any recommendations?
I ride a bike. Doesn't make me green or a tree hugger. I drive a car too.
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Sorry i can't offer any specifics