Any suggestion is warmly welcome

So basically from what I can see in the stats is that your PH isn't quite at a suitable level for your plants to absorb all the nutrients and micro nutrients they need . In a soil medium your plants will be happiest in a PH range of 6.5 to 6.8 . Given that your PH is 7.3 you're currently locking out important nutrients your plant needs in order to really flourish . I would advise that you lower your PH slowly over a couple watering to prevent shock . Lowering your PH to quickly will sometimes lead to stunts in growth and at this stage that's not what you're looking for . I might also suggest that you give your plant(s) a good dose in the nitrogen department . Not a whole lot but just a little bit so that those yellow leaves can go back to a nice lush green and I do mean very little at this point its almost pointless but it would help your plant stay level . Other then that I might suggest adding a little CalMg to your mix , this is basically the essential building blocks for growth , your plant(s) will burn through it quickly at this stage of growth and if it dont have enough it will suffer both in resin trichome production and swelling of the calyx ( the flowers ). I hope this information helps you on your journey ! Happy Growing !