The other hammer’s (I mean aside from the rift one) don’t have better damage. Umbris is just 100 higher than diamond, so they won’t 1-shot the new planets even with lvl 10 damage boon. Rift is the only exception, more discussion was done here about the elevations and tool stats.
Forging stuff here
In summary, if you want to keep having the 1-shot option, don’t increase the block HP without re-balancing the tools.