I am a newbie, just like you, but just recently started using a convex wafer. I was having leaks pretty consistently every other day and had red skin breakdown from the acid. I know my stoma had shrunk considerably, but even though I was using my eakin seal it was not enough. It was leaking out the bottom and with no real warning. I called my ostomy nurse and went in early the next am. They said I had done a good job taking care of my skin as best I could, but knew something was wrong right away when she removed the bag and wafer and there was stool on my skin. My stoma is 7/8 '' but is also more protruding on top and flatter on the bottom and the whole pointed at 8 o'clock which was why I was always leaking out the bottom.
They suggested a convex wafer and I have not had a problem since. It works to help push out your stoma, plus I use a circular eaken seal just aroung my stoma and this is extra security. I would never not use the eakin seal. I have extra of these products of you want to try and I can send thenm to you. I used powder and barrier wipes on my skin and its all cleared up. Hope some of this helos. I think you need to call your ostomy nurse and explain what is happening. It drove me crazy as well. I will be four weeks post-op tomorrow. I ise the hollister convex wafer, mine are pre-cut the eaking seal, and then a mini bag becuase i am so short :)
I am no expert, but hope this helps.
Lizzie