Dear Sarcher30: First than all I would like to speak about VTA and not SRA and this because is more " practical ".
Now, for me is very " easy " an almost in " automatic " because when you are testing or trying different cartridges you learn where that start VTA/SRA is.
I have a process to make the cartridge set up that I use always. Inside that process I use always the same LPs recording tracks, this help me a lot because I know those tracks better than my " hands " ( I know even how should be listen to the clicks and pops in any of those trracks. ).
Btw, in the past I bought additional samples of those recordings but for my surprise the music information/presentation in the new ones ( that came from a different batch. ) was a little different so I been sticky with the old ones.
Now, with MM/MI cartridges normally I start with positive VTA ( tail up ) 2-3mm and from there things goes up/down depending on what I'm hearing. On the cartridge set up process first than all I want to fix both frequency extremes through my selected tracks: this is my main target on the starting set up and these is what I'm looking for from the start VTA. I don't go on till I'm satisfied with and if I can't fix both extremes I look to fix ( at least ) the bas frequency range and from here started again with VTA changes till with out loosing the bass extreme achieve better performance at the other frequency extreme.
With LOMC normally I start with even VTA followed by the same MM/MI process.
In both cases after that first frequency extremes set up I start the fine tunning process where azymuth set up is critical as is cartridge loading.
My cartridge set up process is a simple long one that through the day by day " excersice " converted in an easy tool for me, even there are some times that I jumped two-three steps on that process because the experiences I have.
In some ways each one of us have its own set up process some process more elaborated than other but I think we all have it. Mine works and worked for me with today 98% efficiency thank's to continuous process up dates.
The whole process involves not only the VTA/SRA but VTF, overhang, azymuth, tracking habilities, AS, etc, etc.
My reference is live music and in my home system I have 2-3 cartridges that functioning as references that are the cartridges that after " severe " fine tunning showed the higher overall quality performance level.
Anyway, I think you have the idea about.
Regards and enjoy the music,
R.