"Cambridge Grammar in Use" ( p.902), in the glossary, points to the term "Endweight" but I find it nowhere else as a linguistics term.
Is it because it is Cambridge Univ. Pr.'s own coinage? If not, could anyone please point me to other sources?
End-weight is definitely a linguistic term, not just a stylistic term.
END-WEIGHT (after Quirk et al. 1972) refers to the tendency of heavier constituents to be localized later in sentences, all else being equal, as documented extensively for English and several other languages (though some languages exhibit the opposite, beginning-weight tendency; Sect. 5.1).
Source: Quirk, Randolph, Sidney Greenbaum, Geoffrey Leech, and Jan Svartvik. 1972. A grammar of contemporary English. London: Longman.