I've had communications with QidiTech regarding my X-Max which ships with a standard head and a high temperature head. The tech support suggests using the standard head for non-high temperature filament such as ABS, PLA, PETG and the high-temp for nylon and other exotics. I suspect that the difference might be a PTFE liner inside the standard head that is not in the high-temp. I've read that all-metal hot ends do not fare well with PLA, but I can't remember why.

What model Qidi printer do you have?