Reduce the roster volatility.
Close the transfer portal, but still allow transfers, but with no waivers. Grad transfers can still go without sitting a year, and no rule about only if your school doesn't offer the program.
But on the flip side, formalize the offer process. Offers are written and comfortable, and you can never have more official offers out than the max number of allowable scholarships. Only limitation would be pending academic acceptance. The scholarship offers are also valid for the entirety of your eligibility, even if it's 5 or 6 years.