KT not viable. In every highly competitive game the better choice is double Panzer IV or Tiger I. The KT is slow and cant escape high pen, 60 range tds.
4. OKW
No problems.
JPIV not penetrating is also an issue though some clowns will try to tell you that it is not supposed to pen heavies at 135 fuel end of tech.
LeIG not being able to reliably counter 6men weapon crew is an issue aswell.