You may want to think about the UiHi 5,, and it's a shame they don't have that club in a 6 as the early data would suggest you need the most help there.
If you are working working with a Pro he may want to take a look at how the 5 and 6i are set up. A different shaft may help you make a better swing with those. The performance vs the 7 iron suggest you just are not comfortable with how they are setup for you.
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Not comfortable is a very correct statement. I'm working to finally use my lower body properly. I tend to over swinging the 4, 5, and 6i more often, thus completely kill those clubs performance. When I do remember my tempo and execute a controlled swing...I hit them well.