Good gym, real progress — but technique errors entrenching without coaching frustrated me

I've been training Swimming for 11 months at a decent gym with good coaches. My bilateral breathing has improved significantly and I've developed a real understanding of pace per 100m. the full-body fatigue after a hard set has been a consistent positive.

The one thing that has genuinely frustrated me: technique errors entrenching without coaching. I've read that this is common in Swimming but it's still annoying when you're experiencing it. I've worked around it mostly, but it's the reason this is four stars rather than five. The sport itself is excellent — the frustration is circumstantial.