Bigger leaves yellowing

Hello everyone, and thanks in advance for any insight or opinion.
I've been growing this Mandala Seeds White Bhutanese, in soil, for 3 months now, and she's been flowering for about 25 days.
I didn't feed her anything on the vegetative months, and I started on a lower doses, and the last feeding was the recommended dose.

My concern at the moment, is that most of the older fan leaves have yellowed, dried and dropped, and now some of the newer ones are also following the same pattern.

Is there anything I should try and do at this point to stop this?
Thanks again, kind regards.

Better quality pictures!

Looks like there low on N,They appear hungry but before you go and add hows the pH?

Hello Myke, I do agree they seem low on N... Although I wasn't sure what was causing it. The PH I used on vegetation is 8.4, and thanks to your question, I noticed that's well above the ideal PH for flowering... I have some PH lower solution at home, what do you recommend is ideal for flowering?
Can they absorb Nitrogen and recover at this state as well?
Thanks again.

Ya a little high. Aim for 6.5. But if your dirt is around 8 you’ll have to lower your water to below 6 to counter the high pH. Take small steps and adjust your water to maybe 6 and see. They’ll go a little greener but it will help your buds fill out.

Because I don't have a PPM or EC meter, I went pretty low on nutes. I will correct the PH following your recommendations, and keep feeding the recommended dose for them. Do you think I should feed her extra Nitrogen? Or should the Flowering (Bio Flores) nute which is 2-2-5 be enough? Thanks a lot for the advise, going lower on the PH to counter the alkaline soil makes a lot of sense!.