its not just about coming in to light,, if the bow is shocky or slow,, maybe the design is a bit off, or the mass too much,,
reducing the length can sometimes make is shoot alot better,, increase performance to draw weight and make it shoot a bit smoother,,,, example one time I wanted to make a really long long bow,, so I did, wow it was a dog,, I cut the tips off and re tillered,, it shot much better,, when I weighed the tips I had cut off is was obvios why that length had not worked,,