The fact of increasing the resolution, has only the purpose of further slowing down the print engine as much as possible.
The machine all clean and in place, with the process control (SP3) should balance everything efficiently, there is something that does not come back to me, if I understand correctly, you have 2 identical machines with the same problem, you swap the parts, and the defect remains?... Do you do the initiation of the developer or the PCU when you change? Are drums, toners original?... have you ever replaced the PTR roller?.. try to do as I told you above, and if you do not get a good result, look on the SM, the SP's, to reduce the transfer current on that type of support
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