Favor for silver statuette of Vynora mystery

[Ogare 74]

52.93 silver statuette of Vynora
Per the wiki this should be worth (favor = c * QL² * 0.002) 44.8253584 favor. The in game get price estimate says it's worth about 67 favor.

Frist, I tried using Deed Faith Bonuses for Enchanting to exclude favor calculations and find get price.
Enchanting (0.96611): 0.483055%,

[19:35:20] You think you can sacrifice this to Vynora for about 67 favor.
[19:36:18] Vynora is very pleased with your offerings.

Enchanting (1.41427): 0.707135%,
 

 Wiki gives me Irons-to-points is 200,000:1
1.41427 - .96611 = 0.44816 point change.
200,000:1 = x:.44816
x = 89,632 irons.

52.93^2 = 2801.5849   it's possible there was additional ql precision lost to gui's rounding.

irons = constant * 2801.5849 = 89,632
constant = 31.993319210137090616100907739758 so 32.

Silver has a price modifier of x8.  The base constant is 4?

So far so good. Nice round numbers that don't appear strange.

get price on a rare copper twenty coin
[20:01:55] Price is set to 20 copper.
[20:01:55] You think you can sacrifice this to Vynora for about 3 favor.
The 3, instead of 4, is likely the result of float math and an integer floor rounding. It should still be 1 favor: 5 copper

 

1 favor: 5 copper doesn't make sense for 52.93 silver statuette of Vynora. 
1 favor: 5 copper = 67 favor: x copper
x = 335c
Which doesn't match the 89,632 irons from Enchanting test.
 
67 favor: 89,632 irons = 1 favor : x irons
x is 1337.7910447761194029850746268657

68 favor: 89,632 irons = 1 favor : x irons
1,318.1176470588235294117647058824

The favor from get price is defiantly rounding but it's in that range. 1318 irons per a favor is a strange number.

Am I missing something? I don't know where to go from here.

Edited November 25, 2021 by Ogare
oh my, can't apply linear ratio to things with exponents!

[Ogare 74]

51 minutes ago, Ogare said:

irons = constant * 2801.5849 = 89,632
constant = 31.993319210137090616100907739758 so 32.

Making use of that I can get an accurate ql of 52.924474489596965671258359653198.

And then with some more simple algebra I get:    c=12 and cf=2.4

Actual favor is likely 67.224.
 

 

When did the conversion constant change from 8 to 12? The number I got above seem right.