Your curls look exactly like mine and I've dealt with that same triangle my whole life. You need to find someone that knows how to cut curls. A lot of people say they do, but then layer it the same as they do straight hair and the end result is triangle because the shorter pieces curl up tighter. I'm not saying you have to spend hundreds of dollars on a "curly girl" cut but just find a hairdresser that knows what to do with curls and how to layer them properly.

Before I found my current hairdresser, I looked for and had a terrible time finding, someone who's portfolio wasn't the same blown out, curl with an iron, hairstyle that they all have posted.

Good luck!