Might have to play with doses a little
How much are you using? I find 1/2-3/4 tsp/gal does well. When I fed 1 tsp/gal, it worked well until salt buildup occurred in early flower. Doing 3/4 tsp/gal regularly might be good, but I would mix enough to get 20-30% runoff to reduce the risk of salt buildup. Even at 1/2 tsp, I try to get 10-20% runoff, and a 20-30% occasionally.
I've found my runoff ppm should be in the 1120-1220 range. This ppm (hanna, 500 scale) tracks runoff ph. At this range runoff ph will be 6.1-5.9. If it gets to 1250, I need more runoff. (Runoff ph will be around 5.6-5.8.). If it goes above 1250, I'm facing salt buildup and imminent problems. (Runoff ph will be 5.6 and dropping.).
I don't measure runoff ph anymore because ppm is a good proxy. I don't even measure runoff ppm each time either. I'll check it every other watering starting in late veg. Maybe every watering in early- to mid-flower. It's just an indicator if I need more runoff (modest flush). I don't know if my numbers would match your environment. I'd encourage you to measure runoff ph and ppm each time to see the trend. It's a lot of work, but after seeing the trend in 2-3 grows you'll see how the two relate to each other, where the "tipping" point is, how to balance strength versus volume (runoff).
The simpler solution would be to water for 20% runoff each time. But, if you want to understand it better, you could do the above.
I'm experimenting right now with no silica, no ph'ing the nutrients, no calmag (but I add enough tap water so my starting ppm is 180-220.). Too soon to tell. What I've noticed so far is that my nutrient ph is higher (and doesn't need ph-up). I think the calmag acidifies the mix.
You said you're going to order all the stuff. What is that? I think all you need is F&B and some Hawaiian Bloom. Maybe Jump Start (I'm using Liquid Karma. I'm going to try JS sometime.). There's other stuff, but
@Hermitian doesn't recommend them.
Be careful not to switch to F&B. It's too high in PK. You'll want to scale into it, reducing your AP a little, adding a little F&B until you get to maybe 1 part AP and 1 parts FB in late flower. (Maybe a pinch of Hawaiian added to one feeding at the end of flower as a bloom booster.).
You can use
the spreadsheet to monkey around with this. In veg I'm using 1.8g AP, 0.9g langbeinite, 5ml Liquid Karma for an NPK ratio of 1-1-1.74. If I used calmag (which has N), I'd change that a little to get the same NPK ratio. (If used silica, I'd reduce or eliminate langbeinite.). This ratio is something Hermitian thought would be good to try.