Do what the instructions say. As the other post points out, E6 process puts a stabilizer in the final bath. DO NOT rinse this off.(posted 8783 days ago)Most process chemicals also add a surfactant (which is what PhotoFlo is) to the final bath, so you are getting the same thing.
BTW Kodak Final Bath is not a stabilizing bath. They have a proprietary process that puts the stabilizer in the emulsion earlier, then activates it later.
The typical E6 stabilizer is formaldehyde. Be careful working with it.