I *am* kinda struggling with how to write a character of mine who is a complete potty mouth without swearing too much...
He's a narrator, too.
Well... have you tried creating your own curse words up that imply the same message? I use scum of the sea, which really works. For sea goers at least. Pickled lambs tongue, blood and ashes work as well. I don't use blood and ashes though, sounds too much like Wheel of Time.
I don't know, I just use the old fashioned ones really. A story I'm reading now curses about every other sentence, wasn't expecting that when I first started reading it! Lol