3 different fusers seems unlikely it is fuser. Though that is often the case that it is. I lookup and see AF3030 is same as Savin 8030 so I ask you, have you replaced the FOAM ROLLER?
Also as mentioned by Allan I often see Reg Roller with something on it, adhesive, corrosion. Also failing Broken plastic holders or springs for the Reg Roller or Relay Roller also cause this. Also maybe plastic bur develop on the plastic paper gates near registration/transport sensor.
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