Thanks for running this so carefully. You were right on both.
Round 4 gave you about 1.25 seconds for six stones, which made it a finger-speed test instead of a memory test. The fuel now scales with the sequence: each stone gets 900 ms in round 1, shrinking to 500 ms by round 5. The result panel also stays up for 2.5 seconds before the ad card appears.
Both changes are live now. Wickline is on my list once rating opens.