A convex wafer or a convex insert into your wafer is probably a good idea, given your description of what is going on with your output. I also HIGHLY recommend using Eakin Seals. Even tho the E.S. are sold in shapes like a disk or wafer, they are meant to apply under the wafer that you use for the pouch. Personally, I only use strips of them, cut to fit just around the stoma hole opening of the wafer just like you would apply stomahesive paste or such. With the combination of the convexity and E.S., you may solve your problem rather quickly. I did.
You didn't mention what 2 piece appliance you are using. I use Convatec. It is cheaper for me to buy the convex ring inserts and just pop them inside of the rim of the flange right where the pouch snaps on. Only takes a couple of seconds after you cut the hole for the flange. Be sure to leave the backing on the flange to protect the sticky part while you are doing this step. You will notice that the whole wafer pushes back a bit as this insert is put into it. That's ok. That's what it does. Then when you apply it to your abdomen, the gentle pressure, which I don't even notice, makes the stoma pop out a little and when output is expelled, the stoma doesn't contract under the wafer. Does this make sense? If not, I'll try to explain better......
BTW, make sure you stand or sit up real straight when you apply your wafer. Many times, having excess skin or wrinkles under the wafer does not allow for a good fit. A good example...I'm thin and if I don't stand up straight and actually VERY gently pull the whole abdominal skin area slightly from the stoma as I apply the flange, when I stretch with my arms over my head (like you do in bed), it can really pull the skin under the wafer, and cause a bad "stick" and leaks.
Now I ask .... does this make sense?? You may already know/do this, but I just thought I'd post it.
Best of luck to you.
Diagnosed with CD in 1979, many resections and meds
Perm Ileostomy July 1984 at Cleveland Clinic
Disease free since surgery