One thing I dislike about using a plate to split baits is that the portion you want to remain in the mold seldom does. After trimming they have to be set back in place and that critical surface tension from the injection is gone and when doing the second color the incoming plastic will often lift the half baits and the injection goes underneath. If a person oils the plate to help keep the belly sections in the mold when the plate comes off, then that oil is shot in between the two colors of plastic and delaminating can be an issue.
Secondary to those little glitches, I like baits who's colors sort of melt into each other without a defined line between them....the baits look more natural without the line.
There are plusses and minuses to each technique and people have to decide for themselves what they want to gain.
