If I am reading this correctly, then you are suggesting for a duplex outlet you need to run multiple wires to each outlet, rather than relying on the internal strap or connector between the two?
How I would connect the wires to the receptacle would be branch 2 hot and neutral wires to the existing wire and securing them with the appropriate wire nut and taping that joint, all within the receptacle box. I would also use copper paste on all joints to reduce corrosion and increase conductivity. Connect the two hot and neutral wires to the outside holes, then using the same gauge and type of wire cut a piece to connect to the two inside holes, this would address the bottleneck between the 2 outlets. You can also use just the one hot and neural wire, you can either place the hot wire into one outlet and the neutral to the other outlet or both into one outlet using the outside hole, then jumping the 2 outlets by connecting the same wire into the 2 inside holes, the last remaining hole I cut a short piece of wire and place it in the last hole. This is recommended so that the screw does't bend when you tighten it. Leave the insulation on, only strip the wire that goes into the hole for the jumper wire.
This is the one area where the different receptacles differ, and how I determine which one is better. The way the wire is secured in the hole and size of wire it can accept, anything less than a 10 gauge wire is unacceptable. Remember I did this about 12 years ago so the design of receptacles may have changed by brand. At the time I found the Leviton brand to be far superior, they have the thickest plate that gives the tightest connection for securing the wire in the hole, the Hubbell brand had one of the thinnest and poorest connection. I use the Wattgate (Leviton) gold plated version, gold doesn't have the best conductivity but has better anti corrosion and better contact properties. If you tried A/B test on different receptacles, you may have found that the none plated ones almost always sound better, it's because the plated ones especially the Wattgates take up to a year to break in, given time they usually blow away the non plated ones.