For the most part when dealing with shackle lifts, I was under the impression that the lift you gain is only 1/2 that if what you are changing.
For example, if I put in a 4'' long shackle, my actual lift gain would be 2". So going onthis theory moving the shackle 1 hole would gain you no more than a 1/2 inch difference. Even still moving the location you bolt to would still have the shackle itself in the same position. My suggestion would be to grab a 4.5" angle grinder w/cut off disc and cut away. From one pic it already looks like the shackle made contact with the valance, or at least rubbed some dirt away, that is too close.
Of course you can always cycle the suspension using a floor jack and jackstands (or a forklift if you have one) to see if it will contact. Then you'll know what to do for sure.