you know i fail to see why you think thats so difficult.
25's are lite weight. there would be guys on here who could probably do em way heveir then that.
If you spend enough time doing anythng starting from a lite weight you would be surprised how much weight you can move.
I can DB row 65kg db's easy for as long as I like provided I warm up first.
I think a lot of the problem is guys going in to the gym and jumping straight in to heavy weights becos they either dont have pateints or feel to self concious in front of other guys to start lite.
And saying "but I warm up with 20's before I do 25's" doesnt make what you do a warm up.
go instead on each arm.
12.5's x 12 reps
15's, x 10 reps
20's, x 5 reps
25's, x 3 reps
30's. x 3 reps
Do them slow and deliberate (any true builder knows what that means)
do that then tell me you cant do it without swinging or you think kickbacks are too old school and basic to have any real effect.
enough said?