Never had an issue with 13 and 14, did a full week racing with a 15 without issue.
I never disassemble ball and cups and would have changed the cup if a popping occur.
I tend to change every car I run to full Lunsford kit but for the Xray just the turnbuckles.
Did you change them each time one was popping off ?
Kyosho should fit fine.
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