Underdrive pulley for alt

Ok, so installed a Westin Maxx Winch tray on my 2nd gen, in conjunction with an x-bull 13k lbs winch. I am experiencing power drop when winching, unless I hold the accelerator at about 1200rpm. I was going to install the Genesis dual battery setup, however now I am considering installing a slightly smaller pulley to increase the alternator rpm at idle. One this would be less expensive, and two I wouldn't need to get ride of the expensive optima battery I already purchased. My question is while providing me with the power I need to operate the winch, will it possibly damage the rest of the factory electrical wiring or components?

 

It's a yellow top d27f with a speed cca of 830.

 

Ideally I want to be able to operate the winch without being in the cab. That way I can keep eyes on it without having to worry about the other person either standing and watching, or operating the truck while I stand and watch.