I'm not sure what specific dosages are being cited here. I know that professional opinions differ on how high the dosage can go before you put the Leydigs at risk. I told my doc I'm only willing to go as high as 500 IU every other day, so I've started off there and may drop even lower, depending on what the tests have to say in a few weeks.
It seems the important number to determine is the dosage above which there's no added benefit, and what risk that dosage poses to the Leydigs and as far as aromitization, if any. I've read some hot debates between professionals on what that number is, but as with most things I imagine it varies from person to person, and needs to be found through cautious trial and error.
As for Dr. Crisler, even though I'm injecting every other morning instead of every morning, I can vouch for the psychological benefits. I started feeling noticeable, lasting improvements after my 3rd injection.