Read through some of the old threads on the wahoo kicker as I have a similar issue to a number of users in that there is a consistent 20-25w gap between my quark and the wahoo. The wahoo is reading higher which is strange given the quarq is reading it at the crank.

Story so far is when I first got it it was within a few watts. Then i upgraded the quarq firmware to version 23 from 19. The offset on the quarq has remained constant at -84. Then I noticed the wahoo was reading higher watts it would start off higher at about 4-6w but as the workout progresses it would drift upwards to a difference of 12-14w higher than quarq.

Have done all the spin downs etc after warming the wahoo up and reset the quarq mid ride all to no avail.

Wahoo agreed there was something wrong and sent me their calibration kit. So I recalibrated the wahoo it's offset went from 630 to 410. But now the gap is even bigger a steady 20-25w wahoo higher still.

I am waiting for wahoo to come back but wanted to reach out to see if anyone has a solution to rig the spin down so they match.

Cheers