In the TRT threads I read that 200mg of Test would raise Plasma levels to 1200
ng/ml(?). However, most who are cycling, not TRT, go with 400mg a week.
1) Would this raise plasma levels twice as high?
It would be awesome if there was a linear relationship between AAS/Test Level/Muscle Growth. Unfortunately, there are other chemical factors that come into play. When the Total Test level rises the Test amortizing into estrogen also rises.
2) If so, or if not, is more than 1200
ng/ml(?) better?
I know that Pro BB want as much Free Test as possible. Higher Total Test could be good but really, Free Test is the stuff that you want.
3) Twice as good, or diminishing returns?
I would think diminishing returns. Your body's super smart. It's going to protect itself from unregulated amounts of exogenous Test. I'm no scientist but I did stay at a Holiday Inn Express. 
4) Surely, there is a point at which more is not better, i.e. the body has more than enough to do good and reaches a point where bad is done? And yes, we all know that this (4) is true but the question (4) is meant to provoke better quantifiable answers to the first three.
It takes time for each person to know their "sweet spot" in a cycle. Cycling gear is not something that happens naturally in our lives so I have to assume that your body will not like it a 100% of the time. I've always tried to take as little gear as possible to achieve my cycle goal. More is not necessarily better in cycling AAS.
Thanks!
Oh yeah, its ok (preffered in fact), if you disagree on my thread but please don't bore with defensiveness or name-calling and add lots of good research (and books and stuff) like was provided in the disagreement from earlier this week. Disagreements are fine but observing grown-ups argue is not. Lol