The rectifier mod is done and works as advertised. Picked up almost 2 volts. Thanks for the suggestion
It turned out to be a bit more challenging than expected though. The connector that plugs the rectifier into the wiring harness was routed between the frame and engine case, making it impossible to pass thru.
Rather than drop the engine, I cut the wires, added 2 inches to each wire and a new ground wire, soldered the whole mess back together, and then routed the wiring as shown in the manual.
I haven't put the pro com back yet to see if that is okay. It fires right up on the stock CDI though. And the lights appear brighter.
