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one way to prove it to yourself, synth something x number of times that you can actually HQ and wait it out for new moon on darksday and face the elemental direction your synth crystal is weak too and see if your HQ rate is increased any. It works for me and yes it could be luck but what works for you, works for you lol.

For a positive result wait till new moon darksday before you synth. try a tier 2 synth to try it out. 31 levels above synth for a 30% base HQ rate. Moon and direction can infact increase and decrease your base HQ rate, I had a source but would have to fish it up but anyway try it for yourself.