Chemical Exfoliator?

it really depends on your skin. the toner is recommended for daily use, so the percentage is low, same thing for the pad. I've use an 8% Aha serum with the Aha/bha toner in the past and it was fine for me, so you'll have to try and see. but not all at once, start with toner and bha, and if it's ok, add the pads.

I would use the COSRX or Some by Mi 2-3× a week and the pad 1x a week when not using the toner.

I wouldn't use them together. The Cosrx BHA Liquid is potent and I heard the Neogen one can be quite strong as well, what with it having both chemical and physical exfoliation. The Some by Mi is not as strong as the Cosrx, but can be harsh if you layer with another exfoliating product. Just choose one type and use them sparingly.

Ooood it could be too much exfolliants, just choose one of the products to use. or alternate theirnusage

Don't use them together at once. It's too much! I have the BHA liquid, and it's quite strong by itself, in my opinion. I think only one of these products is enough. The best choice would be the toner because it should be mild enough for daily use. Of course, in the beginning, use it only about twice a week, but then you can increase the frequency if needed.