Evening mate,
I am beginning to believe some strains are more resistant (maybe more sensitive to GA3) to reverse. The same concentration that worked great on the Blue Dream failed miserably with the PC. It produced pollen (much later than the BD) but not a lot and it wasn't what I would call viable pollen. It only produced 9 seed if I remember and only one of the 3 I kept sprouted and wasn't very 'alive' and died on me by the 3rd week maybe.
After seeing a few failed trials with Candida, various concentrations, GA3 and collodial silver, some plants my be impossible to reverse, but I am not entirely convinced YET. Having researched more into plant hormones, GA3 is quite a powerful one responsible for all kinds of weird and wonder effects, stretching, lateral rooting, sex expression or preventing flowering all together, among other things. As it is so powerful, some strains may be so sensitive to it that they require a very narrow range to reverse them, like +/- 5 ppm or maybe narrower. Likely due to the successive inbreeding to stabilize them.
So now I suggest trying 3 concentrations to start, 120, 100 & 80 ppm.
I have also found more into on reversing plants (not cannabis specific) but they were using just silver nitrate solution.