While he may not NEED to, the fact others had elevated fuel pressure at idle shows that there is jn fact a restriction in the flow. If you add more fuel flow the restriction will just get worse.
For the $100 or less it would cost to put in a new return line and adapters, it is kinda silly not to address the issue. Jegs Pro Flow 200 works with all fuels and is way more flexible than teflon lines.
Dont blame the line though.. its not the cause!!