Just remember the the normal range for your lab (200 to 900) is the average range of guys taking that test. My HRT Dr. told me the average person getting the lab work done is a 55yr old male who thinks he has low testosterone. So, if you are in the higher range, it still might mean you have low testosterone. Get it? Anyway that is total testosterone. Bio-available test is what a good HRT DR. looks at. My total test was about yours. But, my bio-available was terrible.
I'm 32 now and on HRT and my test is higher than it ever was. I was like you.
But, now I can cum a few times in a row. (Are you listening BeBegirl and fitbldchic?)
Here is what I did in my twentys to over come this problem. Of course, I practiced the keagle method since I was a teen and practiced holding out while while watching porn. (So, I could last long in my teens) In my twentys I used this keagle (sp?) method to stop in the middle of the first time I was cumming so only about half came out. Then, I would still be hard and last even longer.
For example, my "planned" sexual encounter was to hopefully start out receiving oral then switch to giving her oral (before I came). Then, go back to recieving oral and maybe tittyfuck. I would do this until I would start to come than Bam! shut it down. So, only about half came out. She would be excited I was coming and a little dissapointed. But, I could still remain hard (bc I stopped) So, I throw a condom on and went to town. Lasting longer bc I already let a little go. But, you must have the condom handy. You have to immediatly put it on and put in. Or, the show is over.
Chicks were very impressed whe I pulled it off.
Good luck my horny friend