Same situation here. Using tap tempo, I glitch and mix short and long delay trails together.
Unfortunately, ambient loops suffer because of the inadequate tap tempo handling.
I don’t use BPMs, I use miliseconds as my count. Timefactor has 3000 ms delay time, but the best I can get with tap tempo is up to 1800 ms. And if I miss this magical mark, my tap is either considered non-existing, or worse: Timefactor just picks a shorter, random tempo of its own.