BBO Discussion Forums: ACBL limits on 1NT opening bids - BBO Discussion Forums

I am working on a document to put 1NT opening in perspective for our regional TDs.
I know our national regulations intimately and find the EBU regulations clear, but ACBL is more of a mystery and its web site does not help.
I found the convention charts which clarified which NT agreements are legal at Basic/Open levels (essentially at least 10 HCP minimum and at most 5 HCP range) but unless I missed something say nothing about which deviations are disallowed / allowed and psychic / allowed and non-psychic.
How is it considered if we document 15-17 and intentionally deviate with 14 or 18, or with 12 or 21?

Some key points in the ACBL convention chart PDF are:

Definition of natural:
A NT opening bid that contains no voids, no more than one singleton, which must be an ace, king, or queen, and that does not contain 10 or more cards in two suits combined.

Examples: Definitions
“Psych”: Generally, 2 cards fewer or an Ace weaker than the minimum expected for a
bid would meet the definition of a Psych, as would an Ace stronger than the maximum
expected.

So for a 15-17 NT, opening with 11 or less or 21 and more is a psych (an ace weaker than 15 or an ace stronger than 17). Smaller variations are deviations, not psyches, but "frequent" deviations mean your 15-17 is not actually 15-17 so there's a potential problem with misinformation, or with playing an illegal 1NT opening.