800-900ng/dl is not going to have any significant effect on body composition or strength, although it will jack up your libido and enhance your mood.
Not significant in terms of freaky mass but realize that any extraordinary natural bodybuilder is unlikely to have a T level in that area. And those who do are the ones who tend to be able to put on the most muscle. Also, at my age I'm not looking to put on more size so again, having the T of a healthy 30 year old athlete works just fine for me.
Then again, there's always that extra Primo...

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