This is about the jist of it. There's no "right" answer, just individual user preference. Some guys prefer to hang their light way off the handguard to reduce shadow, but that creates its own challenges (increased chance of damaging light, muzzle blast if not running supressed). Another consideration is how far outboard the light sits. The super streamlined mounts that really tuck the light into the rail are nice, but they really exacerbate the shadow issue.
If you give us some more details on your exact rifle set up I'm sure we could make some specific suggestions.
Yea, I’ve played around with it and that’s about *optimal* for my preferences. Every now and then I’ll shoot unsuppressed, so I don’t want the light hanging way off getting caught on or banging into things.
Suppressor shadow is just something we have to live with.