Generally speaking, people tampering and repasting laptops do nothing good. They work on the assumption that they know better than a company that makes laptops, have factories, QA and whatnot. The chances you F%$# it up are high. The best result if you do a good job is for it to work the same as before or to gain a couple of celsius degrees.
Back in the 2000s I overclocked the shit out of everything I had at hand. Unlocking cpu multiplier bridging the pins with a pencil, flashing firmwares on gpu, all the set. In those days cool people would "uncover" intel cpus so that the heatsink would make direct contact with the chip. To gain 5% of frequency. Repasting back then didn't exist, cause we pasted stuff in the first place
Anyway I'm digressing, my point is that it's unlikely that your laptop was pasted wrong, or the heatsink doesn't make good contact, or any other crap. What is likely is that you have this idea in your mind that it needs to run at 60° under load instead I don't know 90°. If you have proof that's how it should be then fix it. Otherwise leave it, unless you do it just because you can.
