Agreed refs sometimes even up calls sometimes and they tend to let things go when one team gets a bigger lead, but generally over time disciplined teams get called less and undisciplined teams get called more, a bad call here and there has very little impact.
And I don't understand your 2nd point, why would we be favored in a 50/50 game, shouldn't a 50/50 game be... 50/50... and what the hell is a 50/50 game? You call penalties as they are committed, refs shouldn't have a 50/50 bias in the back of there head, that's the bad reffing you are referring to.
The real issue is we are rarely the more disciplined team, hell it's a big part of the opponents game plan to not give us powerplays. Stay out the box and you've dismantled our teams biggest strength for the past 10 years.