You might try different ostomy brands. It takes a while to find a system that works for you. Most brands offer free samples and have ostomy nurses on staff you can consult with.
Also consider moldable barrier rings. They can help with leaks.
As for emptying your bag. Have you tried sitting on the toliet in the regular way and carefully draining that way? I have a colostomy, and sometimes empty mine that way when I'm too lazy to stand.
Are your leaks in the same place on the wafer? When you take your wafer off at changing time, turn it over and examine the seal. Note where the leaks are. Over time, see if leaks occur in nearly the same spots.
You can cut moldable barrier rings. So cut a couple of pieces off. Then, using gloves, squeeze the pieces to flatten them a bit. Stick the pieces where you are getting leaks. Then put your wafer on.
Note: Before putting your wafer on, hold the seal side of the wafer against your stomach on the side opposite your stoma. This will preheat the wafer seal. Then peel off the plastic protective film and install wafer to your skin. Hold it on your stomach for a minute, reposition hands and hold for another minute.
Let us know how you're doing. There are other things you can do.