I picked my own bow and used the below website to calculate speeds at 1,000 grain arrow all the way down to 100 grain arrow in 100 grain increments. I then calculated the momentum in kg*m/s units for each arrow and speed pair. I then calculated drop from 0 to 30 yards in inches using the other website below. It's for crossbows, so I just changed arrow length to 30 inches, should be close. Perhaps I should have calculated drop from 20 to 30 yards with a 20 yard zero. But I think I'll still get my point across.
// This calculator will estimate the speed of the bow/arrow based on the speed rating of the manufacturer and individual setup of the bow. Archers can use
archerycalculator.com
Up to 70 yards out of arrow ballistics information - simply provide arrow weight and speed and our calculator does the rest.
www.bestcrossbowsource.com
I then made a scatter plot with momentum on the y-axis and drop on the x-axis for each arrow. I think momentum not peaking at 1,000 grains might be due to the online speed calculator not taking into account that the bow is more efficient at higher arrow weights, meaning the speeds for the higher weight arrows are likely an underestimate. Although, it momentum must start decreasing with increased weight at some point because an arrow that weighs 500 pounds would have a velocity of 0 and therefore no momentum (extreme example to illustrate). Plot is attached. Excel wouldn't let me quickly label the points with arrow weight, but they are 1,000 grains then 900 etc moving left to right.
All of that was to make this point: there is a trade-off and some nuance and going too far in one direction probably doesn't make sense. Ranch Fairy shoots baited hogs which is very different than whitetails at unknown yardage. Once the minimum momentum is achieved for your prey animal, then you can figure out the maximum drop you can tolerate. This gives you an area on that line where you can pick your setup from. Other factors and personal preference will come into play there. For instance, my graph doesn't show that the bow is quieter with heavier arrows. I'd make the argument that on edge deer will hear and move for any bow and that calm animals don't move much even with louder bows. Also, slower arrows tune easier with broadheads.
As for me with deer, I shoot a 400 grain arrow. I have no problem shooting through deer and can use one pin from 0 to 30 yards.