if you are having cooling issues.
1. Clean the actual surface of the rad, bees, bugs, small dogs get caught in the fins.
2. Drain n Flush.... Drain the coolant and reservoir. Use distilled water (99 cents a gallon at the market, buy 3 of em). Fill the cooling system with pure distilled water till you cant fill no more. LEAVE CAP OFF, start engine, let run for 30 secs. Shut off, Fill again to the top of the neck. Put cap back on. Put tank on, Start her back up, ride till she is fully warmed up.
Drain the distilled water, and refill again with distilled water (TWO FLUSHES) and follow the same procedure again. After the second flush, drain, and fill with coolant. If you want to get fancy use some of that distilled water to dilute coolant down to ~ 75% water 25% coolant for better cooling efficiency, Make sure to fill the resivoir with the same dilution of coolant.
RIDE, come back n let cool, check coolant level, top off if necessary.
Aforementioned in first post, solid cleaning of radiator has been performed.
Your drain and flush sounds legit too. I should have had it done before, not sure why it wasn't.
Anyhoo, went for a ride to a shell station for a MPChallenge, roughly 8 miles, its night, and temp is 61 degrees F. Temp Gauge reaches middle about 4 miles in and stays there, with fan running after reaching gas station.
Left the fan running, key in and on, with kickstand down, and watched the needle. Rose to about 3/4 even tho engine ain't running and fan is on.
This may sound like a stupid observation, but left side of radiator is significantly cooler than right, right after shutting off bike. I could keep my hand on it, but right side would burn after a couple seconds. Middle section on fins, with guard in place wasn't that hot either.
Not sure if that is significant.