Leather Propagation Not Working

[chasingcorals17]

Have a green sinularia leather coral I've been trying to attach to a piece of rock. Tried glueing and a rubber band several times, and even though the rubber band isn't tight, it keeps splitting the coral. So I know have two pieces that were hacked by the rubber band and just found that they've both come loose from their plugs. Hate waking up every morning and having to get my hands in the tank. Yes, they're placed in low flow area

 

Any tips? 

[seabass]

https://reefbuilders.com/2020/04/15/frag-leather-corals-gallery-aquatica-tv/

 

https://bluemonkeysports.com/how-to-frag-a-leather-coral/

 

I believe there are lots of YouTube videos out there.