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Start parallelling those 560 ohm resistors. Twist the legs together on each end of two and you should end up with a 280 ohm 1/2 watt resistor.
Do four to get a 140 ohm 1 watt etc.
Or just get a pack that has lower value resistors so you don't have to parallel that many.
I'm guessing you will only need a few ohms to protect them from the slight over voltage in your situation!
Trial and error but keep checking current draw for different scenarios (voltage and resistors) and you will get a good picture of what they are doing!
Barna
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