You are weak, but you do not have an imbalance. If you really need reassurance, french presses (overhead tricep extensions?) put you at a big mechanical disadvantage compared to normal tricep extensions. I can only do 75 for sets of 13-ish with overhead tricep extensions, and I can strict curl 95 for moderate reps, and curl 95 for high reps with normal form. My triceps are also a lot stronger than my biceps. I also easily use 100 for sets of 12+ in normal tricep extensions, and can even do 105 for a good amount of reps for tricep rollback extensions (since my elbows take less of a beating).
Really, do not over think this. Train both, and if you really want to make sure your triceps get an advantage then train them before biceps.