Idle mixture adjustment screws barely turned open

[Gene Letke]

Recently put a rebuilt carburetor from NCI (National Carburetor Inc) on my 70 C10 350 and it was running very rich (had black smoke). The Idle mixture needle screws were found at 5-1/2 turns open. I also recently had the timing set. I also check every vacuum line, After numerous Idle mixture adjustments, I ended up with both screws at 1/2-3/4 open to get a smooth idle. I read numerous threads, articles, and watched numerous videos on adjustments and no one ended up with such a low number of turns open. My real question is this, seeing it now idles really smooth with no smoke, starts and runs just fine, should I quit worrying that something is still not right.?