How can I improve my Phalaenopsis care? PH adjusting? Supplement suggestions?

[Orchid grower]

Hello everyone!

I am trying to take my orchid care to the next level and looking for suggestions.

Currently I fertilize weekly weekly with two different fertilizers (Growmore's 20-10-20 urea free and sometimes 20-20-20), and occasionally with a seaweed plant supplement.

All of my phals bloomed this past year and I was really satisfied with the results but now I want to elevate my care. For example a couple of my phals have really skinny root growth, and another phals bottom leaves are yellowing (I think it's from a deficiency). Overall I would say my phals are healthy but I want to help them become even stronger and give a bigger bloom display next year (flower count ranged from 4-8 per plant this year).

This past week I started using a PH meter and I am going to start PH adjusting as needed. I have read the PH should range from 5.5-6.5. Does anyone have any experience or success with PH adjusting?

I have some *Calmag* lying around and I am wondering if I should start incorporating that into my routine??

Amazon started stocking Superthrive recently and I am wondering if that's something I should pick up and start using?

Any advice or tips would be greatly appreciated!!! Thank you!