Boxers or briefs make me no nevermind. Aaron has an article up outline a strategy relating to M being a low value — IE the short stack. M is a Harrington term that divides the cost of a tournament round with your stack. Harrington says that when M=6 one is short stacked. Aaron runs it a bit lower to 5 or thereabouts.
While I’ve been there and done that and have scars and the occasional halo from it, I consider myself short stacked approaching M=10. When it is 4 or 5