I try my best to call it consistently throughout the match, tournament, dual meet, etc. Just my opinion, which has been criticized more than once. I make the same calls in the same situation as everybody else in the area that I work. This is high school varsity matches where the wrestling is pretty clean but not error free. Rookies who call it as illegal get educated quick.
Coaches are to meet with official at scorer's table to discuss call.
Often meet at other places around the mat. Call stalling whenever it occurs without hesitation. I am sure that there are many others. Thanks for your thoughtful comments in advance. I agree with you that if it slips just past 90, I'll call it potentially dangerous.