Alvin,
I have experimented with molasses to water concentrations and certainly more molasses speeds the process to a point. I worked to find a ratio that optimizes: time, de-rusting quality and money. For little parts in a mud bucket, I like a rather hot mix of 5:1 (water to molasses). For my larger volume plastic lined box I use outside in the summer I go with a more economical 10:1 ratio.
I usually check the parts once every couple of weeks, and you will know when the active ingredient is getting depleted as it will require longer soak times.
Down your way you should be able to locate a REAL farm supply store. They sell the stuff for feed supplement and dispense in bulk, you will have to bring your own container. You may have to search some, but they are out there. I have a farmer buddy that hooked me up with a 12 gallon pail of the stuff for $10-15. The stuff is almost as heavy as steel though so don't bring a giant container, I about got a hernia lifting that jug out of my car!
Paul