Something to keep in mind when looking for hydraulic offset feature for a rear blade. All the manufacturers do not make their blades offset the same amount. Back when I was looking years ago, no one had more offset capability than Land Pride.
Some are now the same, but to the best of my knowledge no one makes a blade with a greater offset capability and there are some with less, some are a lot less.
Something else to consider, the longer the cylinder stroke, the easier it is to make more precise adjustments.