Isn't Kikumasamune High Moist a hydrating toner? I remember I once saw it and immediately recalled it is quite similar with Cezanne High Moist. This Cezanne also caused me several small bumps, which I suspected as overhydrated, as it is high moist and my skin is still oily (even though at that time it was dehydrated).
I also have used Cosrx Snail, liked it, but no longer use it. It was good for hydrating, but I don't think it is that necessary.
Seeing your problem, I think you might want to change the toner into a milder one, and please, please get a moisturizer as I have experienced it myself, just using toner is not enough. Toner isn't supposed to be left alone, it needs a moisturizer to seal in the moisture. Funny fact, I also used to think I don't need a moisturizer cause there was just difficult to find one but that was where my other mistake took place! I came across a person saying, which made me realize that not using moisturizer also the cause why my skin cannot achieve that smooth texture, it was because I only used toner but not followed by a moisturizer.
For choices of toner and moisturizer, you might want to check Hada Labo brand. I myself also use their products (toner and moisturizer).