Did you say after 3 days? That may be the longest you can expect it to last and plan on changing every 3 days. I'm also wondering why you are using the ring. The best seals you can get, in my opinion, are on the bag.
I had a real deformed area to work with, so much so that my surgeon decided to do the reversal way before she intended. I was allergic to the adhesives, I had a severely inverted stoma that tried to heal closed all the time because of moist edges, and I had fat rolls from previous surgeries and from having lost 100 lbs.
But I'll share what my ostomy nurse advised me to do. Firstly, she had me clean the area well at first and be sure to rinse away any soap, adhesive remover, and any other residue completely, then make sure my skin was air-dried. She put a very thin strip of paste on the inner edge of the barrier of the bag (nearest to the stoma) and let it sit until tacky while I stalled for time cleaning around the sink or something.
Then when I placed the barrier, she had me lay down to make the surface flatter and hold the bag against my skin to warm up, which activated the adhesive.
We ended up applying pieces of the stoma ring into the crevices caused by the fat rolls, but that didn't always work.
I mostly stayed home for the ten months I had it because I often had to change 3 times a day and my skin was so raw! If it wasn't leaking, all the extra goop I used would block the hole in the bag and cause more problems.
Sorry, I regress. You said it yourself: less is best. Give it a try, okay?