Overheating at idle

So tried the new radiator cap (MOTORAD 16 Psi), took it for a nice cruise with very normal operating temps 180-200 depending how fast I was going, brought it home sat in the driveway idling in park for approximately 15 mins and slowly temp increased up to 235 so I shut it off. I could hear coolant going into the recovery bottle. Don't have the IR gun yet but see pics for some temp readings I took of the incoming air going into the rad. Air coming in the bottom through the open space under the bumper is SIGNIFICANTLY higher by 33 degrees. So I'm going to try to cover that spot up with something and recheck.

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