My question is whether burning less leraisum would actually result in less powerful results.
For example, burning a small sliver of pewter gives you the same strength as burning a large nugget of it, the only difference comes with how long you can burn it for. This seems to be the case for all of the metals we ever see burnt.
So why then should lerasium be different? Surely, if it follows the same rule as above, then you could burn a small sliver and still be as powerful as if you had burnt the entire nugget.
I don't think Elend became as powerful as he did because he burnt a big nugget of lerasium, but instead because lerasium itself was the source of allomancy in mankind and since then the power has diluted, so he is comparitively mega powerful. So perhaps one would be capable of dividing the lerasium into many small shavings and making many mistborn from it.