Tested capping my onboarding calls at 2 per week

I've been convinced for a year that my retention problem was an onboarding problem, so I tried cutting my onboarding to two calls a week and pushing the rest into a recorded walkthrough. Two months in, the people who got the walkthrough are churning at the same rate as before. So it's not the format. Now I'm wondering if I've been fixing the wrong hour of the relationship entirely.