Just as an reminder, i did make the edits to Superboy's weaknesses you requested Stein. If you already noticed them though, then feel free to disregard the following. 

 I basically fleshed out his vulnerability to kryptonite. Making it so that he could minutely resist its effect for a very brief time, yet was also viable to be afflicted by a type of sickness similar to radiation poisoning. The idea being that like with humans, it could potentially make him deathly sick as opposed to just making him immediately weak. 

I also expanded on his vulnerability to magic, making it so that magic was just as deadly to him as it was to the average human. Meaning a magic spear to the chest would kill him just as easily as it would the fat cop who loves his triple chocolate donuts. 

Hopefully thats more to your likeing, but as usual, let me know if you wish to see more.