Altogether, I’ve already crafted 180 bows (90 rares, 90 legendaries) so I’m not sure why you think making 250 will be vastly different.
If your claim was true, the approximate results should have been…
20/180 with DEX
160/180 with VIT
The actual results were…
109/180 with DEX
104/180 with VIT
The DEX value varies by 445% from your 1:8 ratio claim.
The VIT value varies by 54% from your 1:8 ratio claim.
The results aren’t even remotely close to your claim.
Save yourself the time and materials.