There is a simple logic to the solution. You must decide where the spindle should be under the foot for best performance. For example, if you like the spindle under the ball of the foot than that is where is should be located for both feet. If you find this asymmetry uncomfortable than move the big foot forward and the small foot back to bring your ankles to a more similar position. Do this in small increments until you find what feels best. In other words, you are "splitting the difference. Unfortunately there will always be some compromise but it should not affect performance in any significant way.
Also if the shorter leg is the same as the leg with the small foot, then definitely try shims. This will make up for some of the difference between the foot sizes (assuming you pedal somewhat toe down).
I'll definetely try it with shims or wedges or both. Googling show me that there is Specialized BG Look Cleat Wedges: https://www.specialized.com/us/en/shoes ... dge/104873
And BikeFit: Bike Fit Systems Bike Fit Leg Length Shims (Package includes one (1) Look Keo Leg Length Shim, three (3) 14 mm, three (3) 16 mm screws, two (2) Look Cleat Wedges (which can be "stacked" to create an additional 1 mm of height),)
I guess the BikeFit option is what i need to try. Any other recommendation for shims/wedges?
Also ill move the cleat 5 mm in the front on the right leg so will test ride it