When your economics are muddled, you risk doing more harm than good. HBD's main function is STABILITY (of the peg to USD 1:1), not YIELD!

HBD is intended as a tool to make the Hive blockchain attractive to trade and to real world exchanges of goods and services. The yield is a tool to the end of STABILITY. The fact that a high yield has "broken the peg" on the upside means the yield should be REDUCED, not increased !

The objective of the witnesses should be to bring HBD back to 1 USD.
Therefore, yield should be managed like central banks manage their funds rate, and this means decreasing the yield resolutely, first to 5% I would say.

Meanwhile Hive should attract users in its own right through the apps that make it the best blockchain out there. Blogging, playing, etc