Well, I can't really encourage DIY and there's a number of reasons. For example, when you went high on the testosterone, you could have gone too high on your RBC counts for example. And there are other potential issues as well. But I also know that many guys feel very pressure by a lack of treatment in some countries. The U.K. will leave men in the 100's and 200's ng/dl with no treatment very commonly from what I've seen, for example, and many guys have debated self-treatment.
But, anyway, let me take a guess at what I think happened to you:
1. At 400 you experienced improvement but your testosterone was not quite high enough to get the kind of benefit that you need. It really depends on your situation, but you have to go high enough with the testosterone to overcome issues such as venous leakage, building those pelvic muscle and inducing at night the kind of neurotransmitter releases necessary for morning erections. You also have to go high enough with the testosterone to build up libido sufficiently. Some studies, as I show in my book, discovered a dose-dependent relationship between testosterone levels and libido. So, in most men, the lower the testosterone, the lower the libido.
2. However, when you get to the high dosage, you began to overaromatize to estradiol. This estrogen, if in overly high quanitities, will dampen or neutralize the effects of the testosterone and this is exactly what has happened to men time and again on the injectibles such as cypionate (and enanthate). Here on the forum, almost all the men on weekly injections are also on Arimidex for just that reason. The HRT clinics try to bring E2 between 20 and 30 generally from what I have seen.
Now here are a couple of important side comments:
--Be very careful with the topicals around women and children. You don't want your child going through puberty at age 8 and your wife/girlfriend singing you baritone lullabies each night.
--The topicals may have risks associated with them. For information on that read about it here:http://www.peaktestosterone.com/testosterone_risks
--The HRT clinics over here generally go with weekly cypionate injections along with Arimidex if needed (and it usually is) for many good reasons and I discuss some of those issues here:http://www.peaktestosterone.com/testosterone_cypionate
--I highly recommend that you learn just as much about estradiol and you have tried to learn about testosterone. Remember: it's generally the interplay of the two that counts in many tissues and you can't just look at one without the other. I'd scan through these links for some basic info:http://www.peaktestosterone.com/Hdr_Estrogen
These links discuss why the HRT clinics are putting men between about 20 and 30:http://www.lef.org/magazine/mag2010/may2010_Why-Estrogen-Balance-is-Critical-to-Aging-Men_01.htmhttp://www.lef.org/magazine/mag2008/nov2008_Dangers-of-Excess-Estrogen-in-the-Aging-Male_02.htm
Hope that helps. Let us know if you have any questions...