I have not heard TZ6 well, yet
. Did work 4S7 for a new one yesterday, though.
Congrats on the 4S. You probably worked the same station (4S7 North South) I worked yesterday on 20m LP. Every day at 0100z I could hear VU and 4S on 20m LP booming into CO. You probably don't need VU but if you could hear 4S VU will be easy for you. Most VU stations are well equipped.
I only wish Pakistan could be on the air as often as the VUs and 4S. I'm still waiting for the QSL on my one and only contact with AP.