Silver-
I think I've got this figured out. Per an online source, Voltage drop on the Seoul P4 is 3.3V. Max current is 1000 mA. Also, I measured 4V on the output of on the LEDs of the MR board. If I plug these into your calculator and using 900 mA for current (giving myself some safety factor) I show that I need a 1 ohm, 2 watt resistor.
So, I'll put a 1 ohm resistor in line with the output on the MR board and we should be good to go.
I wired this up tonight and everything looked good, but not sure if this was as bright as when I tested my blade straight without the MR board, but we'll see, I know my batteries are half dead.
Here's where I got the Seoul P4 specs: http://www.led-tech.de/en/High-Power...80_121_78.html
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