The post by smackdaddy is quite pertinent. If you cant go forward to FLATTEN the main, nor reef ...... and the boat is still overpowered so that it begins to 'radically heel', it WILL begin to 'skid' off to leeward. The skid will cause force components from the water to react against the SIDE of the keel and RUDDER and the rudder will 'feel' like the boat has developed weather helm.
Although not 'perfect' a single line reefing system run back to the cockpit for the main might be a very simple solution for your apparent need. http://www.goiot.com/pdf/p48a.pdf
.... reef cringle rollers to avoid the inherent FRICTION from a single line reef system. Or, you can use 'stout' "S" hooks and small bullet blocks attached to the reef cringles.