Switching to the Convatec convex moldable wafer with a whole Eakin seal and being very diligent with heat and pressure saved my sanity. I began this regime at the same time, so don't know for sure if one or all contributed to my now getting 7-10 days wear.
I finally read the instructions that came with all of my appliances stressing the importance of heat and pressure. Taking suggestions from others, I began to use my hairdryer to thoroughly dry the area and then use it to warm the Eakin seal and the moldable wafer prior to applying them. Eakin goes first directly on my skin around my stoma and then the wafer on top of the Eakin. Once both are in place, I alternate heat from the hairdryer and pressure for 3 minutes or so being very careful to shield my stoma.
Some other warming tips have been to put them under the arm pit or inside the bra [for us ladies]. Another said she puts them in the dryer??? I did read another good tip and intend to try it by placing the Eakin and wafer inside a folded heating pad to warm them while preparing the other supplies. This should work well, as both would be already heated and not have to quickly use the hairdryer to warm them while hoping the stoma does not spew. I will still continue to use my hairdryer for the final heat & pressure step, though.
Another heating pad tip was to lay with the heating pad over all, once applied, for a few minutes if one had additional time.
Also, some recommend "less is more'' when it comes to powders and skin barrier/prep products. I have never had an issue with them, but wanted to mention that it could be a factor.