Yes I have. I think I've messed around with at least a dozen combos especially at the beginning. I tried adding sand, lime, solid fertilizer, liquid, various blends, etc. Anything to try and find a mix that was affordable and so I didn't need to order the stuff by the pallet. I've had some issues with splitting but I think that is more the amount of water each tree is getting and not the soil as I still have a number of trees that are in soil that was pre= fafard.