Clarification: I like to carry 50% and one or two drop tanks in case I engage enemies on the way to a main target planned. Am I mistaken when I believe dropping ord and 25-50% of my fuel will help in an unexpected fight en-route to increase maneuverability and lighten the aircraft for tighter turns? Earlier you eluded that internal fuel vs drop tanks was a better idea/had negligible effect...? 
Well, typically, if I'm upping a jug, I'm pretty deliberate about setting up the takeoff field so as to not encounter any enemies until I'm at my desired altitude. This will mean you have to fly a little farther sometimes. However, your technique is perfectly logical in that you configure the aircraft to strip down to fighting weight instantly should an enemy appear. Personally, I like taking the internal fuel and flying from a more distant takeoff field. I don't like fighting the jug uphill in any circumstance (be it light or heavy), and I will exert some effort to prevent that. That being said, it seems you have a workable technique for yourself--the ability to shrug off the extra fuel or ordnance will make the plane fight much better.
With respect to external fuel tanks versus internal, when I'm cruising to the fight, I like the plane to be clean. I fight the Jug heavy, using altitude, and having the plane free of any extra drag will optimize my cruise speed into the fight. The Jug doesn't accelerate very well, and it can take the Jug a few minutes to accelerate and recover that 15-20 mph that the wing tanks steal. But again, we're probably talking more in terms of personal preference rather than configurations that will either win or lose the fight for you.