OK, if you are reducing Mass, then using the
Maximum V1 associated with that Mass, you have
unbalanced the V1, if you are willing to use an unbalanced V1, then there is nothing stopping you from unbalancing the V1 based on the original Mass, as i said we do this all the time with contaminated runway calculations.
It sounds like you have just become an advocate of optimized V1
BTW, that chart uses the term NORMAL V1, and shows it associated with a field length limit, this is somewhat misleading as it indicates that NORMAL V1 will
always be balanced and field length limited, which is incorrect. It also shows that the Field Length Limit is longer with the lower weight, and this is once again incorrect, with a lower weight you will have a lower Field Length requirement.
If you plot the balanced V1's associated with a particular weight and field length, you will discover that they are linear and show that a higher weight gives a higher balanced V1, and inversely a lower weight gives a lower balanced V1.
Mutt