Try moving over to CSG and run it full bore to get a comparison of temps. CSG does not use AVX. AVX really heats up the processor but on most (not all) projects it makes a huge difference. I wouldn't tear things apart until you've run another project or 2 and get a baseline.
If you look at the WU running on Asteroids it will tell you whether or not it is using AVX ... it's shown at the end of the WU name.
If your machine is running AVX and the temps are within the normal limits then you are good to go. They will never get any hotter than when running the AVX/FMA3 instruction set.