Honestly, I don't think you're taking us seriously.
It's NOT about what you want. You don't get to choose to put him into an excess state of seratonin because mania (or rather the risk of) would be better for YOU! It's not about "so far, so good" and I can almost GUARANTEE you that he would take his current crap over a state of drug induced mania and possible psychosis. Have you ever been drug induced manic? I have, and it was not fun! I was hospitalized because of it. It literally put my family through hell and back. I'm lucky that I don't remember a lot of it, but what I do remember is that returning to a state of normal was horrendous. Constant paranoia and doubting reality.
Sorry, but I don't think you understand what you are doing. Just because others have mixed herbals with prescription drugs doesn't make it ok. I also don't think that you are seriously reading the replies here. You're getting advice from people who have been dealing with PTSD for years if not decades, but you still think that herbals are no big deal (not a big risk). I realize you're new to both the forum and to your PTSD relationship (just a few months), but please don't assume that you know better when it comes to his medication.