Hopefully Eric Reid will chime in. Imo you need ALOT of hip rotation that may require a different saddle and you will get longer in the process.
Thanks for the input! Do you mean I should be rotating my hips forward or backward? I feel like my current level of hip rotation is resulting in the pain - after 45 minutes or so, I feel burning in my perineal area, like I’m being pressed down too aggressively into the saddle, if that makes sense.
If that’s the only issue you are having, pressure in the perineal area, then it may be easily solved with a different saddle.
You mention you are already using an ISM saddle. Maybe make sure you are sitting far enough forward on it, so that your sensitive areas are over the cutout. I think ISM has some guides on their site on how to properly position yourself on their saddles.