In my experience it's been best to use the same manufacturers products with one another as they have been tested to be compatible with each other on a physics and chemical basis.
To also avoid certain patent infringements products are not all exactly the same as other makers products.
There are some exceptions of course, like I have been using one makers stoma powder with another's everything else and suffered no ill effects or degradation of performance. But it's just stoma powder and locked into place with barrier spray etc.
I use Coloplast SenSura Mio wafers and their pectin no alcohol based paste with no issues.
Perhaps your not getting a good skin bond?
I noticed if my skin isn't really, really, REALLY clean, oil free and dry, even the paste will just slide off my skin.
So this is my process now:
Remove water using oil free eye makeup remover
Dry wipe stoma, use no water!
Chisel off remaining stuck on whatever with flat edge of a butter knife, wipe and discard.
Soak oil free eye makeup remover around stoma area to remove any fine invisible adhesive residue and moisture the deep tissue. Ensure skin is absolutely clean. Sometimes a soft fingernail on healthy skin to remove further. Wipe and clean area well with eye makeup remover.
Take a shower and wash 3x the stoma area with ivory type (non moisturizing) soap, just that area and let nothing else get on that skin. This removes the slight greasy feeling left over by the oil free eye makeup remover so successful bonding to the skin can occur. It doesn't dry out the skin because the deep tissue was moisturized earlier, now it's just a matter of removing the surface contamination.
Finger test that the skin is absolutely squeaky all around, this is important.
Dry thoroughly and apply stoma powder just a light dusting to wounds only, brush off any excess and lumps etc that get removed by rubbing lightly or paste or ring will not stick there and leak. Damp wipe off stoma powder off healthy skin or it won't bond. Dry for 2 minutes.
Coat with a LIGHT spray of barrier spray to lock it on, too much will make it smooth and less adhesion. Wait 60 seconds.
I now use Coloplast PREP Dabbler Bottle just to target the wounds, cheaper and more direct, rougher surface, but stings a little as it contains alcohol. Dry for 60 seconds, important!
Apply my paste or ring to the skin side down first to ensure successful skin adhesion.
I don't like rings for the fact that they get handled while stretching and loose some of their adhesion, so paste applied directly from the tube works for me as I don't touch it at all. If things don't stick you start over. If you get output on the skin, you start over. Never use spit to clean, only fresh water and ivory soap.
Once ready slap the wafer on and use a toilet paper tube to hold press hard around the stoma for 3 minutes. Important!
Press the wafer adhesive down as flush to the skin as possible and hold for another 2 minutes.
Apply extra large barrier strips as close flat down to the skin as possible especially in the belly button area. Trapped air under the wafer will cause a humid environment which lossens barrier adhesives so this might be the cause of your problems.
I now, 2 years later, finally getting a steady 3-4 day wafer wear time on a hindged belly fold stoma which is the absolute hardest one there is due to so many complications. I also now can shower daily (not too hot) with the bag on no sweat(ing).
So if you need further help just ask and provide more information. Type of ostomy etc.