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Agree with above re heatsink being the issue
To check for concave heatsink remove it from the CPU, coat it evenly in paste using an old credit card or similar and then press it onto a flat surface such as a pane of glass. the print left will tell you if things are ok or not with the heatsink. If all that looks ok i'd send it all back as it doesn't sound good to me. I'm running 4.2 on air and my temps max at 78degrees
To check for concave heatsink remove it from the CPU, coat it evenly in paste using an old credit card or similar and then press it onto a flat surface such as a pane of glass. the print left will tell you if things are ok or not with the heatsink. If all that looks ok i'd send it all back as it doesn't sound good to me. I'm running 4.2 on air and my temps max at 78degrees