First, I don't think that getting "high", is an option while building a computer, or anything else for that matter.
As for the radiator fans, I have found that mounting them so that they are pulling in outside air, and blowing that cool air down through the radiator fins, is the most effective cooling. Generally 2c to 5c cooler than blowing the internal case's warmer air into the radiator and out the top of the case.
For push/pull cooling, just take a look at the photo I've attached of my own machine. It simply means sandwiching the radiator between the fans. In my case as you can see, the top two fans are pushing the air through the radiator, while the bottom two fans assist, by pulling..."push/pull".
Yes, the 4x120mm mounted on the side panel should be blowing air into the case, as shown in my photo below.
Is increasing the temps of the rest of my machine really worth that extra couple degrees lower on the CPU?