You are right, most slots from QS were max MV but always played like HV games. Lately, they produce mostly HV games which play even worse in between but can pay well.
When I was doing the reviews for Tiger's Glory, Arc of Mystery, Ivan and the Immortal King and now Divine Dreams as well as their next offering called Ticket to the Stars I had similar spells but also scored quite regularly 200X - 500x bet, a few times more than that. All have 5,000x to 12,000x bet win potential.
I play new slots for minimum 3 hours straight and total 5 - 6 hours, sometimes more to see how they perform. Wins on QS seem to be like buses, once they start, you have multiple in a row. For me, Spinions is the best example.