I have knee joint problems. One of the reasons I gave up hill walking. I set the Shoes up so I have as much toe in as I can get and yet to have a knee problem on the bike. In fact- it was looking for a form of exercise that was more gentle on the knees that I took up cycling- so Have you had any Knee problems so far in your riding? By now- you will have got into a certain Toe in when on the platform pedals- so try to work out what it is and set the cleats up to give you the same.
And even with the Tightest cleats around-I still have some movement of the foot. And If I remember right- I bought some pedals once that gave more float than other pedals and I had to stop using them. Under pressure on the pedals and I found my feet moving around too much and it felt awkward.
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How long was I in the army? Five foot seven.
Spike Milligan