The ShamiBuddy (made in Santa Cruz)

This question is for @Kyle_Abbott but anyone can answer if you know what I’m doing wrong:

I seem to be having a problem (keeping the itomaki from slipping I think) when I play. Sometimes the note drops for each string by half a note every 5-10 minutes it seems. I stretched them as Kyle outlined in his intro video (two or three times) so I’m not sure if they’re still stretching out every time I tune it or if the itomaki are just not wedged in enough. Any advice would be great! Ty!