Calculating Sett from YPP for Graceful

A picture of a yarn ball is better
than no picture at all

I've been wanting to try to weave with The Yarn Place Graceful in my stash for YEARS but have been afraid to 'cause it's super thin. It's a "cobweb" weight yarn that very slowly changes color; looking at the colors on the ball leads me to think weaving it on itself would give me some splendid iridescence. I decided to give it a go as one of my looms is empty so I am trying to guess a sett based on YPP... 

The label says 1804 yards/100g (Why? Why? Why do they mix imperial and metric?) 

My rounded calculations gave me 8190 yards/lb, so I went to the Master yarn chart. It's between these two entries but obviously much closer to the 36/2. It's interesting that the recommended setts are the same.

36/2 wool; 8,950 yd/lb (18,025 m/kg); 24, 36, 45

28/2 wool; 6,880 yd/lb (13,885 m/kg); 24, 36, 45

Then I thought of the Ashenhurst formula? It's a way of finding diameters per inch (WPI) including a fudge factor for yarn squishiness...  Here's a couple of lightweight articles on it:

https://notsorigidweaver.com/posts/ashenhurst-calculator/

https://www.schoolofsweetgeorgia.com/avoid-the-wrap-how-to-use-math-to-estimate-yarn-diameter/

Then you calculate a sett number based on interlacements (i.e., closer sett for twill than plain weave as there are less interlacements). Or just follow the suggestions on either of those web pages.

I think I'm going to sample with a turned twill at 36 TPI, I suspect that'll show off the changes in the yarn color nicely.

Left is 30 EPI, plain weave over twill
Right is twill at 35 EPI

Updating with sampling results... I have a turned twill sample at 35 EPI, and turned twill and plain weave at 30 EPI. Both are soft, supple and very very light. DH's comment was "this would make a good summer or fall scarf". I wet finished both by aggressive rubbing it against itself in cold water with soap. The 35 is very appealing to me and the 30 feels just this side of sleazy (yes, that's a weaving term). I'm going to show the samples to friends and to my weaving group and make a decision from there.

I chose the twill to hide the color changes but I'm surprised I don't mind them in the plain weave.