Don’t know how many of you read this (for all I know it is only me!) but it turns out that with a party of 6 or 7 characters, the multipliers for monster encounters changes (in short, I can send more monsters of each CR, or a tougher monster of a higher CR).
The reverse is true if only 1 or 2 people show up for a game.
Well now I know. And knowing is half the battle. ;)