There are multiple unspecified variables. Besides, you used two different solvents so it's not a completely fair comparison.
Did you use the same proportions of lime, water and heptane in both extractions?
Were the soak times at all the various stages of the two procedures the same?
There could well be a qualitative difference between Bestine and lab grade heptane - with the latter being the better solvent, it would seem. Or it could be that the Bestine contains ingredients such as aromatics which reduce the efficacy of freeze precipitation, if that's the recovery method you used.
What does spring to mind is that in the case of the first extraction, the boiling water bath would cause more of the heptane to evaporate and there would be thus a smaller volume of solvent with the consequence being a smaller yield. You would think that the six pulls would have made up for this, however.
Another cause could be inhomogeneity in your plant material, which is hard to account for and seems unlikely but not impossible.
βThere is a way of manipulating matter and energy so as to produce what modern scientists call 'a field of force'. The field acts on the observer and puts him in a privileged position vis-à-vis the universe. From this position he has access to the realities which are ordinarily hidden from us by time and space, matter and energy. This is what we call the Great Work."
β Jacques Bergier, quoting Fulcanelli