I use Coloplast - light convexity Sensura and Assura. These both work well for me. I use the blow dryer on my skin around the stoma once I've come out of the shower. I then use a 3M Cavilon Wipe, which is a barrier protection. Then I let that dry for a minute. I blow dry around the barrier - just to warm it up. Maybe 40-50 seconds moving it at all times. (I use a 1-piece flange/pouch, pre-cut 1 1/8") Has your stoma shrunk yet? If so, you can get pre-cuts, which are wonderful. This will save you a step and you don't have to worry about rough edges from cutting them. Next, I put the Eakin Seal on the barrier. Then blow dry again to warm it up. Warm up my skin again before putting the barrier on. Once I put the barrier/pouch over my stoma, press the barrier and hold it down for a minute. Then I work my hands around the waxy part of the barrier and press so that it sticks. By pressing around the inside of the barrier (where it's hard), this helps the Eakin Seal get a good seal on your skin. This should help with the leaks. Also, I light convexity will work wonders. The convexity was my savior.
Call Coloplast for samples. Check their website too. You can order samples through their website, but it may be better to speak to someone who can give you advice.
Good luck! I hope this made sense.