Thanks! I'll give all that a try.
So you checked for limb alignment and structural damage. No problems there. A new factor was however introduced: a new string.
So maybe verify or check the follow:
1) Check with manufacturer to see if SMG string is an appropriate replacement.
The Tageuk's apparently are armed with Fast Flight strings. I doubt SMGs would be significantly different but just check anyway. Manufacturer may have specifics here.
2) Check with manufacturer regarding brace height. Your new string may not have enough twist in it to effectively keep the bow stable. Check with them on this matter and then adjust brace height if needed.
3) Verify your string length is correct. It may be but just verify somehow.
I know the manufacturer may not be directly reachable so you may have to go to koreanbows.com and ask Freddie. Other than that, that's all I got.