I can curl 35 lb dumbbells no problem with seemingly strict form.

Imo barbell curls highlight imbalances like no other. Even assuming your form is good, you'll get to a point in the set where one arm takes over. Try preacher barbell curls focusing on maintaining even tension throughout both biceps for the whole movement and then going to concentration curls to try to knock out any remaining imbalances.
Tldr; if your biceps are perfectly even do them provided your forms good

>>42420844
Look into EZ bars for curling
I may have read something somewhere about that

>>42420844
are your 35lb dumbbell curls done at the same time?
your body has to brace to lift 70lbs rather than 35lbs on one side.


also, cheat curl (without exaggerated lean back) is beneficial too because it allows you to work a strict form negative at a higher weight

>try really hard not to cheat

That doesn't sound like you can curl with no problems then

>>42420844
You're probably hammer curling the weight halfway up before rotating the arm in and actually training the bicep.