Printer just stops and hangs.. in dual mode

Hi again,
you can check the success of your PID tuning process by sending the M503 g-code command via Printrun to your SV04 iot get a report of all settings including PID parameters.
It is very unlikely that PID tuning has been successful in case that the PID parameters for both extruders are equal. The same applies in case that the firmware default PID parameters are displayed [E0 P29.93 I3.50 D64.04 E1 P30.13 I3.39 D66.88].

If PID tuning has not been successful you may want to try the following procedure via Printrun:

M106 P0 S255; left fan max power
M303 C8 E0 S210 U; run left extruder 210°C PID tuning for 8 cycles & set results

When finished take notes of computed PID parameters for left extruder & continue:

M106 P0 S0; stop left fan
M106 P1 S255; fan 1 max power
M303 C8 E1 S210 U; run right extruder 210°C PID tuning for 8 cycles & set results

When finished take notes of computed PID parameters for right extruder & continue:

M106 P1 S0; stop right fan
M500; save data to EEPROM
M503; report settings

Just in case that the previously computed PID settings still have not been saved:

M301 E0 Pxx.xx Ix.xx Dxxx.xx; set results for left extruder
M301 E1 Pxx.xx Ix.xx Dxxx.xx; set results for right extruder
M500; save data to EEPROM
M503; report settings