craft xp comming up short

[uPgradE]

FT Account name: Cage
Time of bug: this morning (did not note time exactly but between 7-9am Eastern USA) and again at about 04:45-04:50 FT TIME)
Where: house on map -1,0
What: i noticed gold plates are not giving expected xp gain for failed attempts. This morning i tried 57 attemps and failed 44 times. Came up about 10,000xp short. I tried again tonight with 20 attempts, failed 18 times and only got 9000xp (about 4000 short of expected 13,000xp)

Why do i think this is a bug? ....math
1000-(10×chance%)=xp 23%=770xp per fail

Screenshot_2018-10-16-18-21-18.png (198.55 KiB) Viewed 2617 times

Screenshot_2018-10-16-22-30-45.png (178.97 KiB) Viewed 2617 times

Above shots are of the 20 attempts tonight.
18 fails should have given 13,000+ xp.

I was not "speed crafting". I would allow at least one second to pass between crafting next

[uPgradE]

I think i may have found the solution. .. Trade affinity.
770x18=13,880 ..... They didnt mention to take base xp devided by craft affinity to get your xp gain... 13,880÷1.5=9,240xp

770÷1.5=513xp each fail

I was under the impression that affinity gave less chance to fail to succeed... Not that it give less xp as well :-/