Sounds to me like you doing thing right considering you have a SBH and Starline brass. IMHO, OAL can be a subjective issue as the biggest concern is whether the rounds interfere with the barrel & yours do not. I would just experiment between front and rear crimp groove and see which gives you the best results.
I agree with black mamba on crimping. If I learned one lesson on heavy bullets and hot load is crimp is everything.