I do way less on curls than extensions, but I have puny legs all around, lol. As far as I know, most people do more with ext., some much more like you. And your squats are strong, so even though I'm no expert and don't have lots of years experience wise, don't think I'd say there's an imbalance. But what the F do I know ?
A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed.
~~~2 Chronicles 15:7 ~~~
But as for you, be strong and do not give up, for your work will be rewarded.
!!!MY HEAD HURTS!!!
My Training Log