like you said i think as long as you know the proper form and know how to 'not' use it then a bit of body english is ok to get a heavier weight up there for the last couple of reps. But for me its mainly form over weight 90% of the time. But yeh shrugs i have sometin=mes done as heavy as possible, straop myself to the bar and if it moves its a rep type of thing and it definitely helped my trap development.
TEAM CROM (supporter) !!!!