I am always looking for the perfect trigger. My latest experiment utilizes a stock 5 lb connector. I am getting a very short, crisp 1 1/2 lb pull with a good reset. The pad hole location effects the pull more than some think. When drilling the hole in the bar I find it best to go straight up the leg. A carbide bit makes drilling the bar very easy.
You are correct about the pad hole. I have a small block that I rest it on when drilling.
BTW use a cratex wheel to reshape the nose. It removes metal and polishes at the same time.
One more thing - watch out for the height of the nub that pushes the striker safety down. If it is too high it will drag on the slide.
I have a drawer full of ruined trigger bars and pads.