Motors should be fine - they can get very hot but they can handle quite high heat.
Is this a UM Original? Or UM2?
Your photos definitely show underextrusion.
This may be normal at the printing volume you are at. What is the printing speed in mm/sec and what is your layer height? Multiply those 2 numbers plus the nozzle diameter (.4mm) to get the total volume in mm^3/sec.
At 205C you should be able to safely get around 1mm^3/sec no problem.
At 230C you should be able to safely get around 4mm^3/sec no problem.
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