Essentially the tonnage of a 'Mech affects these inter-related factors:
- the engine rating required to attain a certain speed
- the mass of that engine required to attain that speed
- the amount of free space available for weapons and armor
Engine mass goes up at a higher rate than engine rating in BattleTech. This is to ensure that to maintain the same speed, the heavier a 'Mech is, it will actually end up having less tons free for weapons and armor. This is a carefully calculated factor intended to maintain the balance between heavier and lighter chassis.
Speed Tweak fudges the formula somewhat, reducing the effect of this balance factor.
Anyway, I believe we can still get around this for one simple reason:
Speed Tweak may be exclusive to MWO, but MWO also has its own set of special factors that do not exist in other Btech games. One of these special factors is
'Mech size.
Perhaps some enterprising fellow can use a 3D editing program to export the models and compare the total displacement volume of the 'Mechs in relation to their tonnage, and we can see their densities. A high density is preferable, because it means that the 'Mech is smaller and harder to hit for its weight.
I suspect the Centurion and Trebuchet have very low densities (they look gigantic for their low weight), which would indicate part of the the reason why they are uncompetitive chassis.
As an obvious corollary, this also gives a clue toward the solution: shrink their models down to a size that is more appropriate for their low tonnage.
TLDR: Some medium 'Mechs are too big (and too easy to hit) for their weight. Maybe reducing them to proper size would help them.
Edited by Cyke, 20 May 2013 - 03:17 AM.