500 FSIP Controller install Series 03
 

I've been looking to install a 500 amp controller for a little while. Luck would have it I found a used FSIP 500 in Craigs List and picked it up for $250. Got lucky again because it works. It was manufactured in March 2010. My 25" super swamper's really suck up the juice but now it jerks my head back and will jump out of a hole and the cart does 19 on the flat. My only concern is I still have the stock solenoid. It's not that hot, running it hard for 10mins. My question is, is the stock solinoid holding me back? I think it's only rated for 200 amp.All my wiring is 2 guage.
Thank's for all the help guy's.
Steve