Over the past couple months, I've been playing a ton of piano, and over the past couple weeks, it's been even more than usual, like, 3-4 hours a day on days I have work, and 6+ on days I don't. I've been playing and writing a lot of music that uses loud octaves in both hands, or loud chords that involve and octave stretch or more (some of this music literally involves playing an octave as loud as I physically can). As a result, my pinkies have been hurting, like, "bad hurt", not "sore after workout hurt". I think the problem might be that I'm not curving my pinkies enough, since it's a stretch (I can reach an octave comfortably, but it's still a bit of a stretching feeling--I'd say a 6th or 7th is where my hands lie in a completely relaxed state). My technique hasn't changed significantly in any way recently, so I think it's just the amount I've been playing. In other words, I think my technique isn't perfect with octaves, but my hands can handle it for a couple hours without problem. However, with the amount I've been playing, I don't think my hands can handle it.Obviously, I stop doing what I'm doing when my pinkies start to hurt...I usually just play things the same but use 4 instead of 5 for everything, when possible. My 4 is much stronger and has never started hurting from playing octaves or anything.Does anyone have any suggestions to help my technique so I don't hurt myself seriously while playing?