All SARMS have diminished returns past a certain dosage, whereas you can get a huge response of testosterone regardless of doses used.
So if someone says to use a huge stack of very large dose sarms, they are probably selling you the sarms and making money..
This article located here
http://www.sarminfo.com/sarms-and-research-chemical-articles/bro-science-and-why-your-sarm-dosage-is-too-high/
The studies that the current owner of lgd (viking) have done shows:
So they start at 0.5mg and go to 2mg but the results aren't 4x as great, they're barely 2x as a great.
Now run lgd at 20mg Ed and you aren't getting 10x the response, you dig it?
So they get huge results at 2mg of lgd, but the results don't continuously amp up with higher doses, but the side effects do.