If find it interesting that your duct is asymmetrically upward to accommodate the height of the radiator where as mine are just the opposite and I have my cores mounted so high that a corner actually rubs against the cowling.  So I was wondering what the height of your cores were?

I think my cores are the same size as yours.  They're about 8.75" tall.  I also mounted them as high as possible, to give me as much room as I could get for the hoses below.  I had somewhere between 1/8" and 1/4" clearance between the cowl and the cores before installing the oil cooler foam seals.  Now, the compression of the seals wants to pull the cowl downward, and make one of the corners rub on the right rad.  I removed some of the foam, and think I'll be OK again when I get all the screws in the cowl.  I'm even considering a couple mounting screws on the bottom of the cowl, which would attach to brackets on the engine mount if I need to offset the force of the oil cooler foam compression.   The whole installation is just that tight.

BTW, did I answer your question?