New to coco, buds not getting fat.

Hey guys!
I have been l practising with coco and this is my relatively first stable plant. But I have a big issue with her, buds are not getting big enough.
She is a white widow xxl auto from dinafem.
It is 61 days old at today.
Pot size is 18 liters.
I'm feeding her with ec 1.8, I was giving her hesi flowering hidro up to 1.4 ec then raising the ec up to 1.8 with pk. Also adding hesi booster twice a week.
The runoff is ec 1.5 .
The sink water that I use is starting at EC 0.6 .
All water PH is 6.1 including runoff.
Noticed little nitrogen toxicity and not pretty sure how to control it. I was thinking in just adding pk, but it doesn't contains micro nutrients as the flowering nuts.
Watering every 24 hours.
Any help should be great in order to at least get regular size buds.

The plant life cycle is 80 days, when I grow the same strain in soil it usually takes 85-90 days to be ready to harvest.

I'll paying attention to any advise.

Comparison with soil results, same illumination.

Here's my advice: Stop giving nitrogen, maybe only add a little potash (you can make organic one by boiling some banana peels in water and then ph it, works in coco) and let the plant absorb the nitrogen from leaves, they'll eventually start to turn yellow while your buds get fully rippen and ready for harvest.

I'll fed her with just pk to totally remove nitrogen, and hesi boost which also come with micronutrients, hope it works. Any other Idea would be great.

Nobody any other help?

They will fatten up, give them another 4-5 weeks. Make sure temps are under 85.

Watch you don't fry the plants when using pk, and hesi boost at no more than 1ml per litre.

Auto breeders , always tell U how quick there plants are, & there all full of IT, add another 2-3 weeks on what they say & youll be close___________flower nutes & paitence , is needed here , youll be fine

Allright, I'll wait extra 2 weeks and then post the results.