But its weird, this morning the temps on the stress test was 73ºC as I said but, now playing is at 71ºC, I'm really annoyed with this CPU. (Playing a game that isnt too much demanding with CPUs)
CPU temperatures vary with the workload, background processes, ambient temps, AIO heat soak, fan speeds, and a bunch of other factors. Then there's the variability introduced by modern boost algorithms, which are increasingly variable dependent on thermals, power draw, and other factors. Not to mention the variance between different workloads - 100% CPU load just means the CPU is busy 100% of the time, and power draw can vary quite a lot depending on what exactly the CPU is doing. When you mix gaming into this - which will never push a modern 8-core CPU anywhere near 100% - things get even more confusing, as lower loads might mean the CPU boosts higher. In short: looking too hard at your CPU temperatures in a PC used for normal everyday tasks is only really going to confuse you. There's a reason that CPU cooler reviewers use very strictly controlled systems (or ideally use thermal dummy loads rather than actual CPUs). Overall temperatures are far more important than specific ones - how high does the temperature go under high loads, and what are your idle temps like? Unless either of these two are worryingly high (which I wouldn't say yours are), I would leave well enough alone and enjoy using the PC instead of worrying about something that makes no real difference. If you're overclocking and want to push things the thermals need attention, of course, but otherwise the important thing is that nothing is worryingly hot and nothing is throttling.
An example: my system has a custom water loop for my Ryzen 5 1600X and GPU. CPU temps when idle or web browsing are often in the low to mid 30s, but at times they consistently stay above 40 with no significant change in the workload that I can detect. While it would be interesting to know what exactly causes this, it doesn't affect anything, so I haven't bothered to dive into what is likely to be a many-hour investigation. There's simply no point.