Apologies for the late reply. Yesterday was Canada Day.
One detail that stands out to me in your notes is you are trying to print at a speed of 35 mm/s. Usually, the fastest we go is 20 mm/s, and I often print at 6-12 mm/s depending on the design I am trying to print.
For the “M92 Exxxx” command, that simply tells the stepper motor in the DIscov3ry how many steps to turn per mm. If you make this value too high, the stepper motor won’t like it and will make funny noises. The value for “xxxx” is typically 10x of what the value is for filament.
Note this is different than the extrusion speed (in Cura, this is the “Flow%” parameter).
Now, when you are using the Discov3ry, you have to begin by priming the nozzle. You have to build this pressure up slowly, so for a material like Nutella, it will take about 15 minutes for the material to travel through about 55 cm of tubing to reach the nozzle and begin exiting the nozzle. If you set the extrusion speed too high, you will compress the material faster than it is able to move, and that will put more stress on the cartridge, etc.
Once the material begins exiting the nozzle, keep extruding another 2-3 minutes. This builds up extra pressure so your first print layer won’t be too thin. (The extrusion speed during printing then continues to maintain this pressure in small increments.) So once the material has been exiting the nozzle for 2-3 minutes, stop the extrusion (or power cycle your printer), and select the file you wish to print (try 12 mm/s print speed to start with).
Let me know how this goes!