I dunno man, I use the stock sliders on a vtwin for months and never broke 1, I put a Neu 1515/1y on 6s doing donuts and they didnt break. Maybe your hubs have play ? I used the ofna ones but they didnt work well with HPI or proline wheels, only the axials, so i witched to the new traxxas revo ones
LINK no play at all. If those are 23mm you got me, maybe just time for cvds
LINK thats my 2 cents lol