I assume your already listening to Dilloway, but figured I'd throw it out there to anyone that may be visiting the forum who is unfamiliar...his album Concealed is a masterpiece.
This album
https://www.discogs.com/BP-Kerstmis-1980/release/5543741 released as part of the archival reissue series from UE is excellent, I'm not sure if it's tape or lock grooves, or a mix of both...an excellent listen (maybe a little to "fun" for some of the taste of the forum) but it has some very hypnotic carnival esque feel that makes for a haunting late night listen.
The other person I immediately think of when I think of loops is Joseph Hammer, his album Roadside Travel releases by Art Into Life is stunningly beautiful and will really transport the listener. A lot of his stuff seems to be utilizing AM radio music, and I think his album "I love you, please love me too" released by Pan-Act May be using Fela Kutti samples (but I'm not positive), that's a much woozier album and again may not be of interest to everyone. His stuff with Joe Potts unearth the name Joe & Joe is like recycled reality stacked and amplified (especially the recent CD on Helicopter that Wiese released), it's pure existential terror in the best way possible, not a gentle listen (think DENSE like Romero but less monolithic).
I'd also suggest checking out Darksmith and Hsnds To if you haven't already, they both manipulate tape at times...for Darksmith "Countdown to Man in the Clouds" is the most obvious use of it at the top of my head. And as for Hands To
https://noticerecordings.bandcamp.com/album/scrine-1988 though I really love anything from either of these artist.
Blood Stereo (Dylan Nyoukis and Karen Constance) who runs chocolate monk may also be worth exploring. They often have a tape version and live version on their CD-Rs and they also release a lot of tape based music on their label.
Hope that's a decent start.