Just got back in SC. FYI it is not a cartridge BB. I assumed you adjusted it and continued to have issues.

Please try the following:

Loosen the lockring (on the left side of the bottom bracket, opposite
the drivetrain side) by turning it counterclockwise with a lockring spanner,
such as the Parks HCW5. Then turn the BB cup with a 17mm wrench or
cresent wrench clockwise to remove end play or counterclockwise to
loosen the spindle then hold in position while retightening the lockring.
Check adjustment at this point and repeat proceedure as necessary to
acheive correct adjustment. Do not adjust fixed cup on right side of the
bottom bracket. Do not overtighten!

Thanks,
Yan