And my lift blocks are hollow steel.
Blocks are the biggest reason you have axle wrap. On all the different spring combos I have ran, I have never had axle wrap.
Another thing you can do to help stop axle wrap is use an anti-wrap leaf in your spring pack. All it is, is another leaf that goes on the top of the pack. You cut the back half off just behind the U-bolts so you just have the front half in the spring pack. Most aftermarket springs come with them.