How do i change the millivoltage on CGminer?

Okay, so tody i recieved my first serious piece of mining euiqptment, the bitburner fury. after spending house setting it up i have ran into a problem.
When i open CGminer it detecs the BTB ad sets the millivoltage to 1200. At this voltage the miner only runs at around 32GH. when i change where the fan is and the orientation etc it drops to around 30GH. it says on the instructions to set millioltage to 1300, will this make much of a diference? how do i do it? I have tried making a shortcut and a bat file using the following command line:

C:\Users\Joseph\Desktop\CG\cgminer-3.8.1-windows\cgminer.exe -o stratum.bitcoin.cz:3333 -u Pliny12.Sophie -p 123 –avalon-options 115200:32:10:50:256 –bitburner-voltage 1300

If anyone would be so kind to tell me what is wrong with the line i would love them forever! The box just opens then says "unexpected command line arguments" then crashes.

Also what could i do to improve the cooling of the unit? it seems to change the GH quite a bit.