PH for soil or soiless??

ok so a while ago i transplanted 2 of my plants into a mixture of compost and coir mostly coir it was before i read up on things and found out just coir would of been better but i had success before with it probably just luck because i wasnt ph testing anything but now i am and i dont know if i should ph at 5.5-6.0 for soiless or at 6.5-7.0 for soil? also, now my plants are pretty big and im having some problems i figured if i gave them a good flush and started feeding them with a good nutrient mix at the right ph it should solve most of my issues i have them in 5 gallon pots i was also wondering if i really gotta use 10 gallons of water for each plant to flush properly

If you add the dolomite or lime to the soil or soiless mix, you will be fine, no ph needed.

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i have some pickling lime because i grow alot of shrooms and its usually alot cleaner than dolomite or garden lime is it the same thing?

also how much should i add without adding to much because if i add to much wont it make the ph to high or does it just allow the soil/coco to naturally balance the ph where it should be i just wanna fix the problem i got without running into another because i wanna flip them to 12/12 asap but was told should def fix any and all problems before i do that