League average SV% last year was .907
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I don't think the .900 minimum you suggest holds up when the league average is that low ...in previous years when league average was .912 or .915 sure but not last year. Not when there was a generational high 3.14 Goals For average.
And if we stick with that idea ..a league average of .915 and an average goalie on very bad team with a .900 is sufficient/reasonable .015 off.
Our goalies fell into that range.
Dawes .893 .014 off league average .907
Blackwood .892 .015 off league average
Bernier .902 .005 off league average
Gilles. .885 .022 off league average
That's 23, 24, 8 and 14 starts respectively. 69 starts in total.
Gilles is slightly out of the ranges and accounted for 14 starts. But 55 starts from the others are right in that reasonable range for an average goalie on a bad team.