Thats not the way.

Imagine if your weaker side is the left, and with 30lbs you would only be able to bicep curl 6 where compared to your right, you can curl 8-10 with the same weight.

If you use a heavier weight on ur weaker side, what are you trying to accomplish? The key here is Volume.

These are some of the ways that worked for me:
1) When performing alternating exercises(dumbell bicep curls for example), start rep counting with ur weaker side.  If your left begins to fail, then dont proceed for right.

2) At the end of each exercise(or last exercise of the workout, depending on ur energy levels), throw in an additional burn set with lighter weights, rep range 10-15 for the weaker side.

You will notice significant results in a month or so, try it.

Yeap, Am 19 this year. Woah, finally found out how  to blast my outer quads today. Not gonna be able to walk tomorrow heh.