Study more and then tell, look at the thread that tell you how to distinguish between IT and ST, is very obvious. the 4th bar that start from dorsal fin, IT have this 4th bar join direct down to anal part, while ST do not have this 4th go dawn to bottom of body, it sometime found join up to the bigger bar of peduncle, or sometime just on dorsal fin. peduncle bar of ST is one big bar and 1 small bar, while IT is both small bar on peduncle.
http://www.datnoidstigerfish.org/tiger-fish-anatomy.html
http://www.datnoidstigerfish.org/tiger-fish-anatomy.html
You must of missed the "T" also. That's an IT Dat. A nice one too! I would say worth $400 easy. I wish my IT's were that big.