No need to customize the relevance, there’s a Client Setting that can be applied to make it always use Cumulative updates and never the Deltas. I’ll try to find that setting shortly.
Also Microsoft announced last year that April 2019 would be the last month they will publish a Delta Update, switching those to a new Express Update method instead. So this problem will be gone, presumably replaced by some new problem instead.
Edit: see Windows 10 / Windows 2016 Cumulative Only Update Option now Available