You need to first set up the monitoring, then incrementally make changes and evaluate the impacts each incremental change has to the temps. I was initially impressed by your max temp of 76c at 1.35v in your original OCCT post. That's pretty decent for off the shelf cooling. Maybe I should have shared each I used last night, and I can when I get home, but I started with a max of like 71c stock and ended up with a max of 91.5c at 1.45v set (but actual load voltage was only 1.4v). Don't expect the system to exceed 1.4v without custom cooling, you're still doing really well. The goal is not to try and capture a screenshot as it shuts down or crashes. The goal is to set a more conservative personal limit that is less than the absolute limit of the hardware, I believe 95c was suggested, and then gradually increase voltage and clocks to find the highest clock at lowest stable voltage without exceeding that temperature.
Edit: It seems like 1.35v and 4.3GHz is a good starting place. Then you will increase your clock by 25MHz and run a load (what load you use is a personal decision, as Mr. Scott touched on earlier, the goal is to make sure that it can serve your needs without issues, not fly it to Mars). I think for roughing it in one or two cinebench runs is good, then you can test for longer once you get dialed in. This is where you monitor your temperature, not after you have problems. Say you do a couple increments of increasing and now the system crashes at 4375MHz, and you know it didn't overheat because you were monitoring your temperature. Now you can increase your voltage by 25mV and try 1.375v and see if it will run the cinebench at that level. Keep doing that until you reach the personal / soft thermal limit (i.e. 95c). Then you can try something harder or run cinebench on a loop if that gives you more peace of mind.
In your screenshots above you have temperatures but it doesn't show the clock and voltage, and we still don't understand exactly how you are setting those figures either.
EDIT: when we use the term "manual" (well maybe I should just speak for myself), but I interpret that to mean setting a fixed v-core, i.e. 1.35v or 1.45v. I interpret the term "offset" to mean you're setting a "core voltage offset" to +0.05v or -0.05v or +0.10v so that whatever the CPU asks for, the motherboard gives it more or less. I suppose the ideal terminology would be "fixed voltage" vs "offset voltage" since both are entered manually, vs. leaving the settings on automatic. I am not familiar with a good usage of + offset voltage. Some chips will run better with a small negative offset, as it allows the boosting algorithm go higher without hitting thermal limitations, but not every chip will be stable. My advice is to either use "fixed" voltage with "fixed" *****, or offset voltage with automatic or boosting clocks. I think trying to use a fixed clock with an offset voltage creates too many variables.