My method for tuning SA and TX:

First, save your most stable profile.

Then, boot to BIOS and reduce VDD in increments of 10mV (booting to windows each time) until the system won't post or at least won't boot into Windows, then raise VDD 20mV above that voltage.

Run y-cruncher VST. What you are trying to achieve is a profile that errors in VST at a consistent number of seconds in, ideally >5s but <15s. Run it 3-5 times and record # of seconds until failure.

Sometimes a certain VDD voltage will pass 1 cycle of VST or error very late into it (which isn't soon enough to use for tuning), but going 10mV lower won't post and/or boot to Windows (or it errors in <5s in VST, which is not ideal). In this case, use the higher VDD voltage and then begin lowering VDDQ in 10mV increments until you achieve the desired level of instability.

Once you have found the right combination of VDD/VDDQ that gives the desired level of instability, boot to BIOS and save this profile. You will go back to it to tune the other voltage (SA or TX, doesn't matter which you tune first and second) once you tune the first.

After you have saved this deliberately unstable profile, change SA or TX (whichever you desire to tune) in 10mV increments up and down and see if your VST runs improve/increase in duration. If system doesn't post or VST fails more quickly, go the other direction with your voltage change.

Eventually you will find a voltage that increases the duration that VST runs (until the errors are found) by a significant amount. You will either complete the first cycle of 120 seconds or get it to run for >60s. You will then know this SA or TX voltage is more ideal than when it was crashing between 5 and 15 seconds in.

Once you find this voltage, go back to your original "most stable" profile and enter it for SA/TX. Now do stability tests and compare to before