So, what exactly was the goal here?
Simply changing the critical hit chance table? That's interesting.
And, yes, I've been keen on seeing crits happen a little more often, but I decided long ago that the low crit percentage for BattleMechs was due to their design. I'd use something like this for cheep MilitiaMechs and Tanks, though. Although, I'd be more interested in a simple mod to the table I'm used to, like +1, +2, +3 or +4, etc for whatever internal structure type you're using.