Why Does this Delay [poly~] Abstraction Clip? (example included)

Hi - I am trying to create a delay [poly~] abstraction as to avoid clicks (if tapout~ is changed outside of signal domain) and to avoid transposition artifacts (if tapout~ is changed using interpolation within the signal domain). However, it keeps on clipping very hard, and I am not sure why, as my feedback levels are always < .9, and I only have one delay unmuted at a time.

Here is a zip containing both an example patch and my poly abstraction.

Much thanks for any help.