mbower;
What Sparweb;
Posted makes sense to be .
From the days of early NEOs, I remember there being a pretty long discussion about stacking NEOS. Even stacking the hard drive NEOS on top of ceramic ones
The more you stack the less "Flux" depth comes to mind, so if you re-stack those sets you have, per Sparweb's illustration. You should see a similar voltage, not to mention each re-stack will net you spare magnets.
It is certainly worth a try, before ordering more magnets or at least try while waiting for the others to arrive.
Just a thought
Bruce S