At this point, many other people have had more experience with using the 350MA grid charger than I have. I am basing my opinion on what I see in my cell test.
The 9 hour topping @ 350ma I did here:
http://99mpg.com/Projectcars/mimapackwhack/
Rebalancing?
Clearly shows the cells all gradually reaching the same voltage, but it took over 9 hours.
Notice that the cells (fan cooled), are only 7-8 degrees above ambient.
I would recommend one of those lamp timers that have a synchronous AC clock motor. set it at 12 noon, and give it as many hours as you want to run the charge for. They have a set of high current contacts that will easily carry the charger current.
here is an example:
Amazon.com: Intermatic TN111C61 2-Pack Heavy Duty Lamp and Appliance Timers: Home Improvement
Can't get much simpler or reliable than that.