I've been using both together.
Natadrol at 6 day (started at 8/day but backed down to 6 had 2 bottles) when I started my second bottle of Natadrol (wicked sale at NP so I picked up 2) I added in
Testopro at 4 day (2am & 2prebed, sometimes 2 at noon which would be 6 day but only infrequently)
I've been using them steady M-F and none on weekends.