Synth Question regarding HQ and XP

I understand how the HQ works. My question is based off of this: I just finished two synths, 1 with a NQ and 1 with a HQ mat. My quality on the NQ was around 300 and yielded 1500 xp. My HQ mat quality was around 700 to 800 was at like 42% HQ, but I only got 1200 xp from it.

So my question is: Is the xp based off of the actual increase in quality achieved through synthing? I'm having a hard time understanding the discrepancy between the two synths.

Thank you.

XP is based on quality achieved through the actual synth process itself, so for example:

For Synth A you use 2 HQ mats and start with a Quality of 300, and end with a Quality of 400 (difference of 100)

For Synth B you use 0 HQ mats and start with a Quality of 0 and end with a Quality of 200 (difference of 200)

Synth B will give you more XP than Synth A.

You gain 8% exp bonus for every 10 quality you add to the initial quality.