I could only find a couple articles from academic journals detailing the effects of testosterone level on athletic performance and they render no valuable information regarding the ratio and a quantifiable correlation to strength; eg. is the relationship linear, exponential, etc.
There seems to be a lot of broscience in this thread...
What's the difference between a 1:1 and a 6:1? And furthermore what's the difference 6:1 and 17:1? I've yet to see any sound information, only pure conjecture.
The only thing I've seen documented from reputable sources is the obvious conclusion that supplementing one's testosterone increases muscle size and strength. But we all know that. Quantifying the difference between ratios, eg., a 6:1 and 17:1 has not been documented; to the limit of my resources at this time anyway...
http://ajpendo.physiology.org/content/281/6/E1172.long (article from American Journal of Physiology)
http://joe.endocrinology-journals.or.../1/27.full.pdf (Journal of Endocrinology article)
If there's any medical dorks on the board who can link to some better sources, by all means, please do.