i see jmaxton's points, they've been clear from the beginning.  but there's surely a greater allowance for error with more liquid used.  sorry, it was kind of unclear to have said that it's easier to weigh 5ml compared to 50.. not necessarily the case, it's just that it gives one a greater error margin to work with.

speaking of greater error margins, the suggestion of diluting larger amounts at a time is excellent.. indeed, if one is off the mark by 100-200mg, it won't make much difference in that much water.  that should take the edge off whatever inaccuracies there may be.  i think swim will test with about 2.5g DMT fumarate:2.5 L water.