Should I Start Flushing?

Ok So I put my WW's into flowering on Jan 25th, so its days 37 of flowering and they are currently under two 1000 watt hps lights and getting C02 suplementation with 2-3 Excellofizz pucks per day.

So I am noticing that they are starting to plump up nicely and they all have TONS of white hairs but today is the first day I have noticed the first onset of brown pistils. 2 of the plants are approximately 20% brown and the other 2 are 10% brown.

Does this mean I should switch the solution over to a Final Faze flushing solution and straight water? Or should I wait another week-2 to get more growth?

I am not sure exactly when I started flowering them though so PLEASE I NEED SOME ADVICE.

I didn't flush my last crop this early and I ended up giving it 12 days of flushing and it turned out a tiny bit salty....

I found only 1 hermie in the whole bunch early in flowering and just snipped it and looked for more a couple weeks later and saw none.

BUT to my attention as I was looking today, I can only see one of the tops that has seeds growing beginning to swell but still immature. I squeezed one and SNAP it cracked and spewed white undevelopped seed out. It looks like the top has 5-10 seeds growing in it but I think thats it out of all 4 plants... Who knows CROSS MY FINGERS FOR NO MORE SEEDS!!! X-X

Will they be all female seeds?? because it was hermied?