Late to the party and all,,, would like to share my experiences.
Started CS on photos sucessfully. Got talked into trying STS (supplies, photo & chemical houses). Mixed it, deviated it, changed frequency of use, quantity used, tried every combo I could come up with. Part way through all this I converted all to AFs & continued.
Best I got was meager amounts of pollen even opening manually. More often than not,, nannas (not balls). Why? I've no clue. All reports I've seen declaires STS superior to CS.
Frustrations! Part way into a STS I swapped back to CS mid stream. In short time we had balls. Fair amount, but not like I saw with photos. Next round was all CS. Balls to the walls on the same probmatic STSed strains. Why? No clue, none at all. But, I'm not looking back.
With the CS I can extract after seed removal. Not with STS, well, not me anyways.
I'll encourage CS but generally avoid endorsing STS for the above reason. I'll not bad mouth it,, but make mention that it's not what works for me.
I am still puzzled though. Why I failed with STS so miserably and did well with CS? Seems contradictory to most reviews I've read / seen.