Talk to a local O&G attorney. I can tell you that, while surface waivers in mineral leases are common, in my experience it's much harder to do on a tract that size. Operators are giving up a ton of flexibility when they're putting pooling units together and there's a big 85 acre tract in the middle where they can't drill. Often on properties that size or larger we opt for surface protections rather than surface waivers, meaning the surface owner gets some say in where the pad is located, prohibiting pads in certain locations, specifying surface damages, etc. You can also negotiate a surface owners' bill of rights from the seller that wouldn't cover this lease, but would be effective for any future leases. Find a good real estate attorney in the area to help you negotiate and include those items in your contract. It'll be hard to get them after the fact. As for the current lease, you'll have to try some hard negotiation with the current lessee or just live with the risk.
ETA: If it's currently under production, the current lease will be held for a while. See if the oil company will tell you if they have any current plans for future drilling in your unit. Depending on current production they may or may not be interested in drilling more. Sounds like they don't currently have any wells on the subject property, so that's a good start.