I'm going to add my two cents in here. This is just from observation from my own personal experience shooting light poundage trad bows.
I believe bow design, total length of a bow, riser length, limb length and bow string material has something to do with picking arrows for light poundage bows. I've got a long draw length of 30" so I shoot 32" aluminum arrows out of my 66", 42# @ 30" Blacktail Elite TD recurve. The riser length on my Blacktail is 19". The recurve limbs are roughly 28.5" and this distance is measured from the end attached to the farthest part of the riser going towards the grip, then following the curve of the limb out to the end of the limb tip. The bowstring is Dyna97.
My Blacktail prefers a heavy grains per pound arrow. It likes two arrows very well. One is a 32", Easton 2215 aluminum arrow with a tip weight of 175 grains with three, 5" parabolic feathers. The entire arrow weighs 579 grains and this comes out to 13.78 grains per pound.
The other arrow is a 32", Easton 2117 aluminum arrow also with a 175 grain tip weight with three, 5" parabolic feathers. This arrow weighs 613 grains and this comes out to 14.59 grains per pound.
Both arrows hit where I look and almost always in the same place. I've learned the hard way on this since I used to shoot both arrows, one after the other. I dented them because they were almost always clanging off of each other on the target. So, I've learned to shoot one arrow at a time, retrieve the 2215 arrow and then shoot the 2117 or vice versa.
Around Halloween, Norm Johnson of Blacktail Bows will be sending me my second Blacktail Elite TD recurve and it's going to be 66", 35# @ 30" with a Dyna97 bowstring. I've already made up some 32" test arrows for this bow. They are a 2114 with a 130 grain tip weight, a 2212 with a 130 grain and 160 grain tip weights and a 2213 with 130 grain and 160 grain tip weights. All the test arrows will have three, 5" parabolic feathers.
The 2114 will weigh 501 grains which gives 14.32 grains per pound.
The 2212, with 130 grain tip weight, will weigh 474 grains which gives 13.54 grains per pound.
The 2212, with 160 gain tip weight will 504 grains which gives 14.40 grains per pound.
The 2213, with 130 grain tip weight will weigh 505 grains which gives 14.42 grains per pound. The 2213, with 160 grain tip weight, will weigh 535 grains which gives 15.28 grains per pound.
In closing, I know it's not scientific, but it's fun to speculate on what aluminum arrow this new bow will like before shooting it. Right now, I'm guessing the 2114 might be the arrow this bow likes.
BTW; I have a one piece 68", 41# @ 30" Belcher "Longhorn" hybrid longbow with a dacron string and it likes a 32", 2114 aluminum arrow with a 130 grain tip weight. It does not like the 2215 or the 2117 arrows.