Okay so here's the deal I am using these items in parallel to power one load in order to supply enough current (3A max) at a constant 5V. I won't get into detail about why exactly I'm using 12v-8v-5v but during the summer in Texas ambient temperatures average at 35*C which does awful things to large metal clips that are supposed to be heat sinks, so it's best to dissipate heat this way than strait up 12v-5v 1.5A. Additionally I don't need help with heat dissipation, with preferential circuit design, or with buck converters. I would only like advice on how I am supposed to put these two 5v 1.5A supplies in line with either diodes or another method while keeping the 5v status. Since diodes have a voltage drop and I need a constant 5v continuous it will be a hassle to use those unless you can explain how to tie them in. Please provide the solution's part number and datasheet to your answer. The bottom half is not labeled as it is a replicated circuit of the top half.
Thank you for your time :)