Mine felt very snug at the second hole when I was at 23mm...
If you don't mind doing a repeat,... I'd wait and check at 3k more...
...(if it feels like too much,.. maybe it is)... (you're in no danger at 16mm)...
19mm plus... is where we've seen trouble start...
JMHO...
... on the other hand,... if yer' lazy like me...
you might squish it down in there now...
The only harm will be the extra pressure from the spring against the chain... and that's probably insignificant compared to the engine torque...
So,.. are you lazy,... or anal?...
Tough choice...
...
We can say... casual, or, meticulous... if that helps...
...