I have synthetic nutes and no I used top soil as my Base but I'm slowly changing over to just coco coir and perlite so should I be slowly moving closer to ph 5 as u get less and less soil frankly it's due to the fact I have so much soil that it's a waste but as I use it I add more coco coir and perlite right now it's probably a 3rd of each the ph thing in one of my pots was odd but it seems to be fixed now ... IdK maybe my gf was pissed at me and throw something in it idk lol .. It's getting fixed nowit depends on how much you added,as lots of quality soil has coco coir and perlite already in it.plus whether you use organic or synthetic nutrients makes a difference too,coz they work differently in the medium.