On my winter schedule, (likely what you should do now)
On feeding days, I add the pre-soak water, and the quart of nute solution. The next day or so I slowly add water enough to get the lower root zones moist. Perhaps a half gallon or so. About a half cup of runoff total, which in itself is a mini-flush. That is usually enough to last till next feeding, but if humid and I've cranked-up the fans...sometimes I'll need to add another quart of ph'd water to tide 'em over.
Summer schedule is to feed twice a week, and daily watering of a quart or two.
And always monthly flushes to remove salts/excess nutes and micro's.

About adjusting the soil... most commercial potting mixes already have lime in it. Usually lasts ... IDK...3-4 months or so. Murphy's law states that it'll exhaust usefulness mid way through flower, depending on last transplant, lol.
Have you tested water ph then run it through, and tested runoff from a fresh pot of soil you haven't ammended?
Rusty Trichome Reviewed by Rusty Trichome on . Seems to be a bad Phosphorus deficiency mid-flower. I've taken advice from other threads, but I'm not getting too much improvement. More details follow the form. H=Answer if you grow hydro or aero C=Answer if you grow coco S=Answer if you grow traditional soil L=Answer if you grow soilless other than coco (Promix, Hyponex, SunshineMix) R=Answer if you grow in RockWool T=Answer if you grow in HydroTon D=Answer if you run any type of automatic drip system, including into soil or soilless E= EVERYONE needs to answer lol! Rating: 5