1990/91 Eddy Merckx Corsa Extra

come on, man, you should be easy on yourself! =))

from my, not so extensive, experience, weight difference between SLX and TSX is quite tangible, so if you say

then you shouldn't have any doubts, TSX doesn't feel light

No doubts now. Had none before really, but excessive research gives blind-alleys and conundrums. Good job I'm a shadow-boxer.