Keep trying different manufacturers. Contact Hollister to get free samples of their 2-piece system.
Please describe your wafer change process.
Removing the wafer. Very important. Don't pull the wafer off, no matter how careful you are. Use medical adhesive remover spray or wipes. Gently lift the fabric edge of the wafer, use a finger to gently roll skin away from the wafer while holding the fabric steady. Use remover wipes to separate the wafer from the skin around the wafer's main seal. Take your time. It's easy to damage skin without realizing it.
Cleaning/prepping the peristomal skin. Make sure your soap contains no lotions, dyes, or fragrance. These chemicals interfere with wafer adhesive. I use Cetaphil soap. Skin must be dry. Some ostomates use a blow dryer, set on low, to ensure the skin is totally dry. Do you use barrier film?
Cutting the stoma hole, test fitting the wafer. How much clearance, wafer hole to stoma, do you have?
Warming up, molding, and stretching the barrier ring. Then fitting it around your stoma. Do you cut through one side of the ring? Then, wearing gloves, stretch, pull, and pinch the ring until it's a long ribbon? How do you fit it to your stoma?
Installing the wafer. Do you warm it up first? Wear a belt after installation?
Hollister 2-piece system is what I use. With a snap-on bag...after wafer installation, you could fit a second barrier ring on top of the wafer, around your stoma, then snap on the bag. So a double seal. Also, you can snap off the bag to rinse it out, or check the ring, reposition it, or put on another. The 2-piece system gives you a few options a 1-piece does not have.
You do need to get that bile output under control. Some ostomates eat a few marshmallows to slow output, but that's temporary. Hope you get help soon.