Well, some thoughts on that :
6 engine slots (default iirc) then +2 slots for clan XL in each torso bringing the total to 10.
explaining the ST loss handicap of 20% (2/10)
Then the same could be done for IS XL ? 6 +3ST each ST, going for a 25% penalty instead ? (3/12)
Bigger the engine size, bigger the effect of losing a ST.
The "superior" tech shows with Clan suffering a lighter penalty than IS.
PGI could even create quirks for torso losses, so that certain chassis or variants aren't affected as much or even more than others.
Just my random 2 cents.
Edited by WarmasterRaptor, 21 November 2015 - 03:29 PM.