|"fresh paste has been applied & at an adequate amount"|
That would mean just a tiny dab, no larger than a grain of rice, placed in the center of the CPU & not spread around like you're buttering a piece of toast, correct?
This is the correct way
This is the wrong way
"Speedfan says Vcore1 is overheating"
Vcore is the the CPU voltage, it has nothing to do with overheating.