There is a problem with your numbers.You don't hardly EVER get an increase in ke when going lighter.
Usually there is another problem,like underspined arrows not being as efficient and/ or tune causing a problem.
.Didn't you have problems with this?
Agreed, and yes, I did. BUT, when I changed to my lighter arrows they were also stiffer so I was able to increase the poundage a little to get it where I like it. The arrows I had before were indeed underspined, so I had to turn the poundage down quite a bit for them to spine properly....These new arrows also seem to transfer energy much more efficiently as well.