Should I use distilled water instead of tap water and jus add nutes? I have a feeling my tap water is a little on the hard side 354ppms

Yes. A lot of my unexplainable nutrient problems went away when I switched from my 220 ppm tap water to R.O. water. Now I add Calimagic.

Distilled water is about 6.25 ph Tested using water distiller

I'm using a water distiller.() Check out my grow. got a picture of it ✌️0 ppm but I add a bit of nutrients/minerals

You 'can' feed your plants distilled water, but it can start to get pricey and you have to keep in mind that it has 0ppm. You will be losing out on some of the good additives in the water like micronutrients. If you make up for it with other micronutrients and monitor your PH then it should be fine.

That is very high ppm for tap water almost "dangerous to drink". But, your plants look great! You need to feed a little more nutrients I think, but I use rain water when possible if not my tapwater is around 99ppm.

I thought it was abit acidic too (distilled) use bottled spring water just test them till u find a reliable and cheap brand

I believe distilled water is to acidic?