You can’t use Putrefy before SS in the opener, as you won’t have a ghoul to explode. And there’s no reason to force a SS when it’s not the optimal choice just because its free.
Its also… not that random at all? You have two procs that change your rotation slightly, and they both just boil down to “hit da shiny new button”.
if you look at the sequence for each of them, it’s pretty simple, because they don’t conflict- even if you want to maximize the pointless “free” SS
You press Putrefy. If Soul reaper triggers, press it.
If you have pestilence, press outbreak and then Putrefy.
If you have a free SS, press it
If you have less than 3 runes, press a RP spender.
If you don’t have charges to summon ghouls, press FS.
Otherwise, press SS.
For the vast majority of builds, you’ll only take one of those, and the focus will either be on hitting soul reaper when it procs, or hitting pestilence before you hit SS again.
If playing with both procs is too random for you, you should probably not force the AoE disease management talent and the ST execute talent together, and should just run more minion talents.
If one random proc in the opener is too random for you, I would recommend using the one-button rotation.