Confirmed for our Ambush interpretation, also.
No Static Man. roll, if all situational mods and Stealth vs Perception matchups were successful, we allowed the +/- to any crit happen as soon as an attack connected.
Another thing we did was allow weapon bonii to be applied to Criticals as I hated robbing a character of their favourite artifact due to a 1-5(20) result on some charts.
It still happened, but only with breakage checks.