Follow me here - it will all make sense

High C rating is beneficial in high amperage setups, example - MOD class. If your current battery will "cover the spread" of your current set up, it will not make a difference.

Think of "C" rating as a milkshake straw. The bigger the straw the easier it is to get the milkshake. The smaller the straw, the harder you have to work to get that same milkshakethrough the straw. If you have a thinner milkshake, you can use a smaller straw ("C" raiting) to acheive the desired effect..Considering your lips as the motor and the milkshake as the battery.

There is no patent on that analogy - you may run with it at your leisure.