This is a good subject. Good advice and suggestions all around here. Dhk is right, for starters -- you need to approach this from a saddle position standpoint before you do anything else.
A degree tilt forward helps some for obvious reasons, and a degree tilt back can work for equally intuitive reasons: sometimes, your body naturally rests forward on the saddle nose, and it takes a bit of a backwards tip to pull you off of your crotch and back onto your sit bones. Inching it forward a touch might be worth a try as well.
Work on a trainer is always harder on your crotch/butt than real riding. When you're out, you're naturally shifting, standing, moving forward, moving back, making constant adjustments to your position... in a trainer, you tend to lock into one or two positions and force yourself to hold for the next 3,000 strokes. Soft tissues suffer.
On that note, I second (third?) the recommendation that you NOT pursue padding or gel as the easy answer. General wisdom holds that for long-term soft tissue health, true support from a firm platform works better for most in the long run. The minimalist jobs out there -- the SLK, the SLR, the Aspide, the Aliante and Arione -- aren't just popular because they look cool.
Some swear by cutouts, but they're a problem for me. Cutout-equipped saddles tend to give me numbness faster than smooth ones -- I think it's the extra set of edges. Pinched-nerve and clamped-artery inducing edges...
The Arione works for me because, though it's thin, flat, firm and racy, it's got a long, broad horizontal surface that doesn't leave you straddling a thin nose with your soft tissues. It seems to support the pelvis in a way that feels more like sitting on a firm seat than a rail, which is what the Trans-Am feels like to me.
Good luck with your search... your genitals deserve the best.