Well Tom I know that you are decreasing the area of the cooler that will see cool ambient flow. So logically it wont cool AS well ......
However yes as you say we the end user can decide how we wish to mount the kit when we get it. If I see a need to mount the PS cooler differently I will do so. No hard feelings. I like what you guys have done here.
I understand where you are coming from. However the problem is much more complicated than these couple of posts describe. Also, we aren't talking about just your level of understanding here. We have a range of experience from noob to veteran in this thread and some may see anything negative as more of an issue.
Let me just throw out a few points that might cause you to at least agree that this may be the best position for the stock cooler to cool as well as stock assuming you make sure your ducting isn't blocking it.
1. The intercooler core has far greater resistance to airflow going through it than the PS cooler. Air will have a tendency to blow through until the pressure raises then it will blow around the IC if you the buyer duct the IC well and leave the bottom open then the PS cooler well actually receive faster flowing airflow along the bottom as long as the air can escape. In effect the whole system will be one giant duct and where a good portion of air from the car driving will go through that PS cooler.
2. Look at all the ford cars made and ask yourself which ones have BOTH a separate PS cooler AND an external fluid reservoir? This is one of the few. Most of the cars use a combination Resevoir/pump right next to the engine
3. Just the very fact that there is a PS cooler inline will sink heat and also radiate heat to the surroundings and still making it significantly cooler than another type of PS system.
4. Cooling the fluid a bit more is only there to preserve the PS oil from breaking down. i.e. it allows the oil to last the life of the car. HOW MANY people actually have flushed and changed their PS system oil at all? How many of those who did ONLY did a partial because they lost fluid when they opened it up to swap a 3L or whatnot? Most of them I"m sure.
5. If you drain and flush your PS oil once per year or even once per two-years then it would be more effective than even having the Oil cooler in the first place.
6. There is only ONE set of fins on the PS core that is basically U-shaped. You can't tell me that 1" of distance going across the first tube is going to significantly heat the air up as it's crossing the second tube so that it won't also cool that one. NOW if there was no airflow through it then yes you would be correct in your assumptions.
So here is our logic when designing this kit:
We thought this out. When we were trying to position this PS cooler. WE felt that it would be better for the PS cooler NOT to be in front of the IC so that the IC had the coolest possible air to help protect the engine from high intake temps....better to protect the engine from detonation first before anything else right?
Then we thought about behind the IC but when the car is under boost the Temps hit about 190*F at only 8-9psi. How well will that PS cooler cool the oil in air temps near 180-200*F? Not as well as it would if it just had a smaller slice of fresh air that Oh By the Way is also forced in under a bit more pressure than it would through the intercooler.
As far as why we both posted.... your statement was said in such a way like it was some gigantic surprise like a detective had to be around to find out about it and it sounded Very Negative to me. And on top of that you didn't just ask us what our reasoning was before you said "It Won't Cool Very Well."
So of course no hard feelings.

I just hope that next time there is an issue you give us a chance to explain our reasoning by asking us before passing judgment.