Happy Holidays!
Did you use spacers with either BB? By the OEM manual it should be 2.5 mm spacers on the non drive side. Has anyone tried Ryet x Senix ceramic BB? The reviews look promising.
I've always been happy with the spcycle one https://it.aliexpress.com/item/1005007698085870.html
The number of spacers depends on the type of bottom bracket and crankset (Sram or Shimano). Here is the Ostro Vam assembly manual:https://assets.ctfassets.net/uyc32o2uod42/2MPYR6VZUI4GEDZsr9EEd7/f5c0f9a1baebd142a7de5ec99f55d265/2024_Ostro_2.0_Manual-v2.pdf
The use of spacers depends more on the chain line and the crank axle being securely fastened without any play.Not all frames use a T47A bottom bracket. Some replicas of the Factor VAM frame use the standard T47.
if not T47a, it isn't a replica