Quality-based exp bonus? Don't get too excited...

Synth quality exp bonus is based off the difference between the initial quality and the ending quality and is in no way affected by the inital quality.

Evidence:

Target Synth - Rosewood Lumber(46)
Target Crafter - CRP 43
Item Used - Rosewood Log +3

For the first synth, I didn't record the inital quality, but here's the end result.

http://i66.photobucket.com/albums/h2...wtfQuality.png

I was baffled by the miniscule bonus for such high quality, so I tried another one, this time deliberately trying to get as little quality as possible.

Initial Quality: 311
http://i66.photobucket.com/albums/h2...tfQuality2.png

ARGH! I was so frustrated after seeing that. I purposely was waiting to use by Rosewood Log +3s until after 1.20 patch because I thought I'd get more exp...

If you're not convinced by just these two synths, here's one other data point that seals the deal. I made a Peiste Leather(41) on my LTW 41 using an NQ Peiste Skin. This was before I did the Rosewood tests, so I didn't note the starting quality, but the ending quality was 31. I got a 10% exp bonus.

Given just these few data points, I'm confident in saying that the exp bonus is
([Ending Quality] - [Initial Quality]) ÷ 2.5 rounded down

Initial: 308
Ending: 317 (Difference: 9)
Bonus: 3%

Initial: 311
Ending: 324 (Difference: 13)
Bonus: 5%

Initial: 306
Ending: 451 (Difference: 145)
Bonus: 58%

Initial: 316
Ending: 460 (Difference: 144)
Bonus: 57%

However, it's possible that they're just rounding down when displaying the bonus percentage to the log window and they may not be rounding when applying the bonus to the exp, but I'm not going to waste my time trying to figure that out.

This could be a measure to stop people spamming/botting though right ?

It means that people who actually try to gain more quality will gain more xp for their efforts.

Using all HQ materials may mean higher quality but not the same amount of effort.

In theroy HQ materials should produce more effort as you have a lot more Durability to play with.

The exp bonus relating to quality has always been based on the amount quality increases from the starting value, it's just a bigger bonus now and is shown explicitly in the log. I like the change. If Raldo's numbers are right, then it means a bonus of 100 exp for increasing quality by 100 points when doing a synth that matches your level. Could have been bumped up a little more, but this is good.