Seems to be holding but the patch chrysaled and I started a new one next to it. I used a saw kerf on the new one and it seems to have stopped it. Filled the kerf with Osage chip glued in with good quality super glue.
My answer - stop making weak spots on your bows.
Forget about patches for now just learn how to tiller properly.
Might sound harsh but it's the best way! Make a tillering gizmo if you are struggling.
The patch chrysaled because you hadn'd fixed the problem that caused the original chyrsal.
An area will only chyrsal if it is very overstrained - simple.
Normally there will be a stiff spot tipward of the chrysal.